Confidence:StrongSolidPlausibleTentativeSpeculative

• Hazel of the Rootbloom

  2BG

  Legendary Creature — Squirrel DruidBG

  One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
• Koma, World-Eater

  3GGUU

  Legendary Creature — SerpentGU

  Both cards produce the same kind of effect (shared token subtype).
• Sothera, the Supervoid

  2BB

  Legendary EnchantmentB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Sothera, the Supervoid's death or sacrifice trigger.
• Chevill, Bane of Monsters

  BG

  Legendary Creature — Human RogueBG

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Chevill, Bane of Monsters's death or sacrifice trigger.
• Minsc & Boo, Timeless Heroes

  2RG

  Legendary Planeswalker — MinscGR

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Minsc & Boo, Timeless Heroes's death or sacrifice trigger.
• Bloodline Recollector // Ancestral Craving

  1BB

  Creature — Vampire Warlock // InstantB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Bloodline Recollector's death or sacrifice trigger.
• The Meathook Massacre

  XBB

  Legendary EnchantmentB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling The Meathook Massacre's death or sacrifice trigger.
• The Serpent Society

  1BG

  Legendary Creature — Human Snake VillainBG

  Koma, Cosmos Serpent is a sacrifice outlet, enabling The Serpent Society's death or sacrifice trigger.
• Mari, the Killing Quill

  1BB

  Legendary Creature — Vampire AssassinB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Mari, the Killing Quill's death or sacrifice trigger.
• Meren of Clan Nel Toth

  2BG

  Legendary Creature — Human ShamanBG

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Meren of Clan Nel Toth's death or sacrifice trigger.
• Liliana, Dreadhorde General

  4BB

  Legendary Planeswalker — LilianaB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Liliana, Dreadhorde General's death or sacrifice trigger.
• Quest for the Gravelord

  B

  EnchantmentB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Quest for the Gravelord's death or sacrifice trigger.
• Bequeathal

  G

  Enchantment — AuraG

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Bequeathal's death or sacrifice trigger.
• Syr Vondam, Sunstar Exemplar

  WB

  Legendary Creature — Human KnightBW

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Syr Vondam, Sunstar Exemplar's death or sacrifice trigger.
• Kraven the Hunter

  1BG

  Legendary Creature — Human Warrior VillainBG

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Kraven the Hunter's death or sacrifice trigger.
• Rampart Architect

  3G

  Creature — Elephant AdvisorG

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Rampart Architect's death or sacrifice trigger.
• Toshiro Umezawa

  1BB

  Legendary Creature — Human SamuraiB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Toshiro Umezawa's death or sacrifice trigger.
• Shaile, Dean of Radiance // Embrose, Dean of Shadow

  1W2BB

  Legendary Creature — Bird Cleric // Legendary Creature — Human WarlockBW

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Shaile, Dean of Radiance's death or sacrifice trigger.
• Malicious Affliction

  BB

  InstantB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Malicious Affliction's death or sacrifice trigger.
• Enduring Renewal

  2WW

  EnchantmentW

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Enduring Renewal's death or sacrifice trigger.
• Glissa, the Traitor

  BGG

  Legendary Creature — Phyrexian Zombie ElfBG

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Glissa, the Traitor's death or sacrifice trigger.
• Liliana, Heretical Healer // Liliana, Defiant Necromancer

  1BB

  Legendary Creature — Human Cleric // Legendary Planeswalker — LilianaB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Liliana, Heretical Healer's death or sacrifice trigger.
• Lolth, Spider Queen

  3BB

  Legendary Planeswalker — LolthB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Lolth, Spider Queen's death or sacrifice trigger.
• Skullclamp

  1

  Artifact — EquipmentC

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Skullclamp's death or sacrifice trigger.
• Kaya's Ghostform

  B

  Enchantment — AuraB

  Koma, Cosmos Serpent is a sacrifice outlet, enabling Kaya's Ghostform's death or sacrifice trigger.