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.
• Baron Helmut Zemo

  BBB

  Legendary Creature — Human Noble VillainB

  Copy engine: one card makes a copy of a creature every turn, and the other's enter-the-battlefield effect rewards each copy. Real, repeatable value — the partner can't untap or re-enter the copier, so it never goes infinite.
• Desolation Twin

  10

  Creature — EldraziC

  Both cards produce the same kind of effect (shared token subtype).
• Ulamog's Dreadsire

  10

  Creature — EldraziC

  Both cards produce the same kind of effect (shared token subtype).
• Kozilek's Command

  XCC

  Kindred Instant — EldraziC

  Both cards produce the same kind of effect (shared token subtype).
• Spawnbed Protector

  7

  Creature — EldraziC

  Both cards produce the same kind of effect (shared token subtype).
• Warping Wail

  1C

  InstantC

  Both cards produce the same kind of effect (shared token subtype).
• Kozilek's Unsealing

  2U

  EnchantmentU

  Both cards produce the same kind of effect (shared token subtype).
• Mirrorhall Mimic // Ghastly Mimicry

  3U

  Creature — Spirit // Enchantment — AuraU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Propagator Drone

  1G

  Creature — Eldrazi DroneG

  Both cards produce the same kind of effect (shared token subtype).
• Dino DNA

  1

  ArtifactC

  Copy engine: one card makes a copy of a creature every turn, and the other's enter-the-battlefield effect rewards each copy. Real, repeatable value — the partner can't untap or re-enter the copier, so it never goes infinite.
• Idol of Oblivion

  2

  ArtifactC

  Both cards produce the same kind of effect (shared token subtype).
• Unfathomable Truths

  4U

  InstantU

  Both cards produce the same kind of effect (shared token subtype).
• From Beyond

  3G

  EnchantmentG

  Both cards produce the same kind of effect (shared token subtype).
• Cursed Mirror

  2R

  ArtifactR

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Foul Emissary

  2G

  Creature — Human HorrorG

  Both cards produce the same kind of effect (shared token subtype).
• Rionya, Fire Dancer

  3RR

  Legendary Creature — Human WizardR

  Copy engine: one card makes a copy of a creature every turn, and the other's enter-the-battlefield effect rewards each copy. Real, repeatable value — the partner can't untap or re-enter the copier, so it never goes infinite.
• Wharf Infiltrator

  1U

  Creature — Human HorrorU

  Both cards produce the same kind of effect (shared token subtype).
• Callidus Assassin

  4UB

  Creature — Human Shapeshifter AssassinBU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Emrakul's Evangel

  2G

  Creature — Human HorrorG

  Both cards produce the same kind of effect (shared token subtype).
• Shrill Howler // Howling Chorus

  2G

  Creature — Werewolf Horror // Creature — Eldrazi WerewolfG

  Both cards produce the same kind of effect (shared token subtype).
• Blight Herder

  5

  Creature — Eldrazi ProcessorC

  Both cards produce the same kind of effect (shared token subtype).
• Malevolent Rumble

  1G

  SorceryG

  Both cards produce the same kind of effect (shared token subtype).
• Deceptive Frostkite

  UU

  Creature — DragonU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Path of Annihilation

  3G

  EnchantmentG

  Both cards produce the same kind of effect (shared token subtype).