Caves of Chaos Adventurer representative art for Boros Initiative

Art: Marcela Medeiros © Wizards of the Coast

← Legacy metagame

Boros Initiative

11 decks from 10 events · 12 Aug – 9 Sep 2026

11Decks0.8% of published lists
14.3%Win rate 2.6–51.3% · 1–6–0 · 7-match sample
55.7 of 75 ConsolidatedSlots settled18 cards, each in 80% of lists or more
19.3 slotsStill argued overspread over 27 cards, in both boards

Maindeck 60 slots

4 copies in every list 4 copies in 1 list out of 4 1 copy in every list always 1 copy, sometimes 2 Grey means 80% of lists or more. Violet means fewer.

Settled core

17 cards · 52.3 slots
Ancient Tomb 100% Ancient Tomb1st 100% · 2nd 100% · 3rd 100% · 4th 100%
Cavern of Souls 100% Cavern of Souls1st 100% · 2nd 100% · 3rd 100% · 4th 100%
Caves of Chaos Adventurer 100% Caves of Chaos Adventurer1st 100% · 2nd 100% · 3rd 100% · 4th 100%
City of Traitors 100% City of Traitors1st 100% · 2nd 100% · 3rd 100% · 4th 100%
Elvish Spirit Guide 100% Elvish Spirit Guide1st 100% · 2nd 100% · 3rd 100% · 4th 64%
Forest 100% Forest1st 100%
Lotus Petal 100% Lotus Petal1st 100% · 2nd 100% · 3rd 100% · 4th 100%
Mountain 100% Mountain1st 100%
Once Upon a Time 100% Once Upon a Time1st 100% · 2nd 91% · 3rd 27%
Plains 100% Plains1st 100%
Seasoned Dungeoneer 100% Seasoned Dungeoneer1st 100% · 2nd 100% · 3rd 100% · 4th 100%
Simian Spirit Guide 100% Simian Spirit Guide1st 100% · 2nd 100% · 3rd 100% · 4th 100%
Undermountain Adventurer 100% Undermountain Adventurer1st 100% · 2nd 100% · 3rd 100% · 4th 100%
Chalice of the Void 91% Chalice of the Void1st 91% · 2nd 91% · 3rd 91% · 4th 91%
Chancellor of the Annex 82% Chancellor of the Annex1st 82% · 2nd 82% · 3rd 82% · 4th 9%
Chrome Mox 82% Chrome Mox1st 82% · 2nd 55% · 3rd 36% · 4th 27%
Trinisphere 82% Trinisphere1st 82% · 2nd 82% · 3rd 82% · 4th 82%

Still argued over

8 cards · 7.7 slots
Karakas 73% Karakas1st 73% · 2nd 64%
Karn, the Great Creator 73% Karn, the Great Creator1st 73% · 2nd 73% · 3rd 64% · 4th 64%
Eldrazi Confluence 55% Eldrazi Confluence1st 55% · 2nd 36% · 3rd 9% · 4th 9%
Archon of Emeria 27% Archon of Emeria1st 27% · 2nd 27% · 3rd 27% · 4th 18%
Mox Diamond 27% Mox Diamond1st 27% · 2nd 27% · 3rd 27% · 4th 9%
Witch Enchanter // Witch-Blessed Meadow 18% Witch Enchanter // Witch-Blessed Meadow1st 18% · 2nd 9%

2 cards are in fewer than 10% of lists. Their rows are not shown. Their 0.5 slots still count in the total above.

Point to a card to read its copies. Each percentage is the share of lists that play at least that many.

Sideboard 15 slots

Settled core

1 card · 3.5 slots
Disruptor Flute 91% Disruptor Flute1st 91% · 2nd 91% · 3rd 82% · 4th 82%

Still argued over

19 cards · 11.5 slots
Ensnaring Bridge 73% Ensnaring Bridge1st 73%
Liquimetal Coating 73% Liquimetal Coating1st 73%
Mycosynth Lattice 73% Mycosynth Lattice1st 73%
Sarevok's Tome 55% Sarevok's Tome1st 55%
Eldrazi Confluence 45% Eldrazi Confluence1st 45% · 2nd 45% · 3rd 9%
Sphere of Resistance 45% Sphere of Resistance1st 45%
Broadside Bombardiers 27% Broadside Bombardiers1st 27% · 2nd 18% · 3rd 18% · 4th 9%
Grafdigger's Cage 27% Grafdigger's Cage1st 27%
Leyline of the Void 27% Leyline of the Void1st 27% · 2nd 27% · 3rd 27% · 4th 27%
Magus of the Moon 27% Magus of the Moon1st 27% · 2nd 27% · 3rd 27%
Solitude 27% Solitude1st 27% · 2nd 27% · 3rd 27% · 4th 27%
Karn, the Great Creator 18% Karn, the Great Creator1st 18% · 2nd 18% · 3rd 9%
Kozilek's Command 18% Kozilek's Command1st 18% · 2nd 18% · 3rd 18% · 4th 18%
Pyrogoyf 18% Pyrogoyf1st 18% · 2nd 18% · 3rd 18% · 4th 18%
Roiling Vortex 18% Roiling Vortex1st 18% · 2nd 18% · 3rd 18% · 4th 18%
Staff of Domination 18% Staff of Domination1st 18%

3 cards are in fewer than 10% of lists. Their rows are not shown. Their 0.5 slots still count in the total above.

Point to a card to read its copies. Each percentage is the share of lists that play at least that many.

The lists people registered 11 published lists in this window. Pick one. The lists can reach past this window. The numbers above count only this window.

Every list

newest first
Show decklist for kozz27
5–0 kozz27 Legacy League · 2026-09-07 · 5-0-0 Representative

Maindeck (60)

Creatures (23)
  • 3 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
  • 1 Witch Enchanter // Witch-Blessed Meadow 18%
  • 3 Chancellor of the Annex 82%
Instants (4)
  • 2 Once Upon a Time 100%
  • 2 Eldrazi Confluence 55%
Planeswalkers (4)
  • 4 Karn, the Great Creator 73%
Artifacts (13)
  • 4 Chalice of the Void 91%
  • 1 Chrome Mox 82%
  • 4 Lotus Petal 100%
  • 4 Trinisphere 82%
Lands (16)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 1 Karakas 73%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 1 Liquimetal Coating 73%
  • 1 Sphere of Resistance 45%
  • 1 Broadside Bombardiers 27%
  • 1 Ensnaring Bridge 73%
  • 2 Eldrazi Confluence 45%
  • 4 Pyrogoyf 18%
  • 1 Sarevok's Tome 55%
  • 3 Fury 9%
  • 1 Mycosynth Lattice 73%
Elvish Spirit Guide
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.
Show decklist for kozz27
5–0 kozz27 Legacy League · 2026-09-05 · 5-0-0

Maindeck (60)

Creatures (22)
  • 3 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
  • 3 Chancellor of the Annex 82%
Instants (6)
  • 2 Once Upon a Time 100%
  • 4 Eldrazi Confluence 55%
Planeswalkers (2)
  • 2 Karn, the Great Creator 73%
Artifacts (13)
  • 4 Chalice of the Void 91%
  • 1 Chrome Mox 82%
  • 4 Lotus Petal 100%
  • 4 Trinisphere 82%
Lands (17)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 2 Karakas 73%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 4 Disruptor Flute 91%
  • 1 Liquimetal Coating 73%
  • 1 Sphere of Resistance 45%
  • 4 Broadside Bombardiers 27%
  • 1 Ensnaring Bridge 73%
  • 2 Karn, the Great Creator 18%
  • 1 Sarevok's Tome 55%
  • 1 Mycosynth Lattice 73%
Elvish Spirit Guide
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.
Show decklist for kozz27
5–0 kozz27 Legacy League · 2026-09-03 · 5-0-0

Maindeck (60)

Creatures (23)
  • 1 Broadside Bombardiers 9%
  • 3 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
  • 3 Chancellor of the Annex 82%
Instants (3)
  • 2 Once Upon a Time 100%
  • 1 Eldrazi Confluence 55%
Planeswalkers (4)
  • 4 Karn, the Great Creator 73%
Artifacts (13)
  • 4 Chalice of the Void 91%
  • 1 Chrome Mox 82%
  • 4 Lotus Petal 100%
  • 4 Trinisphere 82%
Lands (17)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 2 Karakas 73%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 4 Disruptor Flute 91%
  • 1 Liquimetal Coating 73%
  • 1 Sphere of Resistance 45%
  • 3 Broadside Bombardiers 27%
  • 1 Ensnaring Bridge 73%
  • 3 Eldrazi Confluence 45%
  • 1 Sarevok's Tome 55%
  • 1 Mycosynth Lattice 73%
Broadside Bombardiers
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.
Show decklist for kozz27
5–0 kozz27 Legacy League · 2026-08-30 · 5-0-0

Maindeck (60)

Creatures (23)
  • 4 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
  • 3 Chancellor of the Annex 82%
Instants (4)
  • 2 Once Upon a Time 100%
  • 2 Eldrazi Confluence 55%
Planeswalkers (4)
  • 4 Karn, the Great Creator 73%
Artifacts (12)
  • 4 Chalice of the Void 91%
  • 4 Lotus Petal 100%
  • 4 Trinisphere 82%
Lands (17)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 2 Karakas 73%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 4 Disruptor Flute 91%
  • 4 Kozilek's Command 18%
  • 1 Liquimetal Coating 73%
  • 1 Sphere of Resistance 45%
  • 1 Ensnaring Bridge 73%
  • 1 Staff of Domination 18%
  • 2 Eldrazi Confluence 45%
  • 1 Mycosynth Lattice 73%
Elvish Spirit Guide
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.
Show decklist for kozz27
#28 kozz27 Legacy Challenge 32 · 2026-08-29 · 1-3-0

Maindeck (60)

Creatures (23)
  • 4 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
  • 3 Chancellor of the Annex 82%
Instants (4)
  • 2 Once Upon a Time 100%
  • 2 Eldrazi Confluence 55%
Planeswalkers (4)
  • 4 Karn, the Great Creator 73%
Artifacts (12)
  • 4 Chalice of the Void 91%
  • 4 Lotus Petal 100%
  • 4 Trinisphere 82%
Lands (17)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 2 Karakas 73%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 4 Disruptor Flute 91%
  • 4 Kozilek's Command 18%
  • 1 Liquimetal Coating 73%
  • 1 Sphere of Resistance 45%
  • 1 Ensnaring Bridge 73%
  • 1 Staff of Domination 18%
  • 2 Eldrazi Confluence 45%
  • 1 Mycosynth Lattice 73%
Elvish Spirit Guide
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.
Show decklist for motown4
5–0 motown4 Legacy League · 2026-08-25 · 5-0-0

Maindeck (60)

Creatures (23)
  • 3 Archon of Emeria 27%
  • 4 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
Instants (3)
  • 3 Once Upon a Time 100%
Artifacts (19)
  • 4 Chalice of the Void 91%
  • 4 Chrome Mox 82%
  • 4 Lotus Petal 100%
  • 3 Mox Diamond 27%
  • 4 Trinisphere 82%
Lands (15)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 4 Disruptor Flute 91%
  • 4 Roiling Vortex 18%
  • 3 Magus of the Moon 27%
  • 4 Leyline of the Void 27%
Archon of Emeria
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.
Show decklist for kozz27
5–0 kozz27 Legacy League · 2026-08-24 · 5-0-0

Maindeck (60)

Creatures (23)
  • 4 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
  • 3 Chancellor of the Annex 82%
Instants (2)
  • 1 Once Upon a Time 100%
  • 1 Eldrazi Confluence 55%
Planeswalkers (4)
  • 4 Karn, the Great Creator 73%
Artifacts (14)
  • 4 Chalice of the Void 91%
  • 2 Chrome Mox 82%
  • 4 Lotus Petal 100%
  • 4 Trinisphere 82%
Lands (17)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 2 Karakas 73%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 1 Grafdigger's Cage 27%
  • 4 Disruptor Flute 91%
  • 1 Liquimetal Coating 73%
  • 1 Ensnaring Bridge 73%
  • 2 Eldrazi Confluence 45%
  • 1 Sarevok's Tome 55%
  • 4 Solitude 27%
  • 1 Mycosynth Lattice 73%
Elvish Spirit Guide
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.
Show decklist for kozz27
#24 kozz27 Legacy Challenge 32 · 2026-08-16 · 2-3-0

Maindeck (60)

Creatures (23)
  • 4 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
  • 3 Chancellor of the Annex 82%
Instants (2)
  • 2 Once Upon a Time 100%
Planeswalkers (4)
  • 4 Karn, the Great Creator 73%
Artifacts (14)
  • 4 Chalice of the Void 91%
  • 2 Chrome Mox 82%
  • 4 Lotus Petal 100%
  • 4 Trinisphere 82%
Lands (17)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 2 Karakas 73%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 1 Grafdigger's Cage 27%
  • 2 Disruptor Flute 91%
  • 1 Liquimetal Coating 73%
  • 1 Ensnaring Bridge 73%
  • 4 Pyrogoyf 18%
  • 1 Sarevok's Tome 55%
  • 4 Solitude 27%
  • 1 Mycosynth Lattice 73%
Elvish Spirit Guide
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.
Show decklist for kozz27
5–0 kozz27 Legacy League · 2026-08-16 · 5-0-0

Maindeck (60)

Creatures (26)
  • 4 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
  • 2 Witch Enchanter // Witch-Blessed Meadow 18%
  • 4 Chancellor of the Annex 82%
Instants (2)
  • 2 Once Upon a Time 100%
Planeswalkers (4)
  • 4 Karn, the Great Creator 73%
Artifacts (11)
  • 3 Chrome Mox 82%
  • 4 Lotus Petal 100%
  • 4 Trinisphere 82%
Lands (17)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 2 Karakas 73%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 1 Grafdigger's Cage 27%
  • 4 Disruptor Flute 91%
  • 1 Liquimetal Coating 73%
  • 2 Wrath of the Skies 9%
  • 1 Ensnaring Bridge 73%
  • 1 Sarevok's Tome 55%
  • 4 Solitude 27%
  • 1 Mycosynth Lattice 73%
Elvish Spirit Guide
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.
Show decklist for motown4
5–0 motown4 Legacy League · 2026-08-16 · 5-0-0

Maindeck (60)

Creatures (27)
  • 4 Archon of Emeria 27%
  • 4 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
  • 3 Chancellor of the Annex 82%
Instants (3)
  • 3 Once Upon a Time 100%
Artifacts (15)
  • 4 Chalice of the Void 91%
  • 4 Chrome Mox 82%
  • 4 Lotus Petal 100%
  • 3 Mox Diamond 27%
Lands (15)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 4 Disruptor Flute 91%
  • 4 Roiling Vortex 18%
  • 3 Magus of the Moon 27%
  • 4 Leyline of the Void 27%
Archon of Emeria
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.
Show decklist for motown4
5–0 motown4 Legacy League · 2026-08-13 · 5-0-0

Maindeck (61)

Creatures (23)
  • 4 Archon of Emeria 27%
  • 3 Elvish Spirit Guide 100%
  • 4 Simian Spirit Guide 100%
  • 4 Caves of Chaos Adventurer 100%
  • 4 Seasoned Dungeoneer 100%
  • 4 Undermountain Adventurer 100%
Instants (3)
  • 3 Once Upon a Time 100%
Artifacts (16)
  • 4 Chalice of the Void 91%
  • 4 Chrome Mox 82%
  • 4 Lotus Petal 100%
  • 4 Mox Diamond 27%
Enchantments (4)
  • 4 Roiling Vortex 9%
Lands (15)
  • 4 Ancient Tomb 100%
  • 4 Cavern of Souls 100%
  • 4 City of Traitors 100%
  • 1 Forest 100%
  • 1 Mountain 100%
  • 1 Plains 100%

Sideboard (15)

  • 4 Disruptor Flute 91%
  • 3 Magus of the Moon 27%
  • 3 Karn, the Great Creator 18%
  • 4 Leyline of the Void 27%
  • 1 The One Ring 9%
Archon of Emeria
Point to a card to read its copies. Bright names are in 80% of lists or more. Dim names are still argued over.

Who plays it top pilots in this window

Method

A slot is one card in the average list. For each card, we count the lists that play at least one copy, then at least two, then at least three. We add those shares. Add every card and the boards total 60 and 15.

The settled bound is chosen at 80% of published lists. Settled slots are grey. Other slots are violet. Cards in fewer than 10% of lists still count in the argued-over total, but their rows are not shown.

The band bounds are chosen. Locked starts at 60 settled slots out of 75. Consolidated starts at 50. Debated starts at 40. Open is below 40. A locked deck is not a better deck.

Share is share of published decklists, not of the field. MTGO publishes exactly 32 decklists per Challenge, whatever the field size. A 448-player event gives the same 32 lists as a 32-player one. Those 32 lists lean heavily toward the top of the standings.

Leagues publish 5–0 decklists and no match data. They count in the deck total, in the share, in the card slots, and in the pilots, because a registered list is a registered list. They stay out of the win rate, because there is no match to count. So deck counts and shares cover all published decklists, and win rates cover paired events only.

Preliminaries contribute nothing. They publish match records but no decklists, so their matches have no archetype to attach to.

Win rates count only matches where both players published a decklist. The published 32 are the top finishers. Counting their matches against players who did not publish a list would push every archetype's rate up. With both sides counted, every win has a matching loss. So the pool always balances at exactly 50% wins.