Confidence:StrongSolidPlausibleTentativeSpeculative

• Intruder Alarm

  2U

  EnchantmentU

  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.
• Captain of the Mists

  2U

  Creature — Human WizardU

  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.
• Sky Hussar

  3WU

  Creature — Human KnightUW

  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.
• Aura of Dominion

  UU

  Enchantment — AuraU

  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.
• Court of Vantress

  2UU

  EnchantmentU

  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.
• Court of Embereth

  2RR

  EnchantmentR

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

  5WW

  InstantW

  Both cards produce the same kind of effect (shared token subtype).
• Summon: Knights of Round

  6WW

  Enchantment Creature — Saga KnightW

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

  2W

  InstantW

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

  2WB

  EnchantmentBW

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

  G

  Creature — Elf ScoutG

  Copperhorn Scout untaps all (or many) permanents, refreshing Dion, Bahamut's Dominant's tap activation.
• White Plume Adventurer

  2W

  Creature — Orc ClericW

  White Plume Adventurer untaps all (or many) permanents, refreshing Dion, Bahamut's Dominant's tap activation.
• Terra, Magical Adept // Esper Terra

  1RG

  Legendary Creature — Human Wizard Warrior // Legendary Enchantment Creature — Saga WizardBGRUW

  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.
• The Circle of Loyalty

  4WW

  Legendary ArtifactW

  Both cards produce the same kind of effect (shared token subtype).
• Jace, Ingenious Mind-Mage

  4UU

  Legendary Planeswalker — JaceU

  Jace, Ingenious Mind-Mage untaps all (or many) permanents, refreshing Dion, Bahamut's Dominant's tap activation.
• Gideon, Ally of Zendikar

  2WW

  Legendary Planeswalker — GideonW

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

  3RW

  Enchantment — SagaRW

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

  2R

  EnchantmentR

  Aggravated Assault untaps all (or many) permanents, refreshing Dion, Bahamut's Dominant's tap activation.
• Éowyn, Shieldmaiden

  2URW

  Legendary Creature — Human KnightRUW

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

  1WW

  Creature — Human Rebel KnightW

  Both cards produce the same kind of effect (shared token subtype).
• The Thirteenth Doctor

  1GU

  Legendary Creature — Time Lord DoctorGU

  The Thirteenth Doctor untaps all (or many) permanents, refreshing Dion, Bahamut's Dominant's tap activation.
• Veteran Beastrider

  1GW

  Creature — Human KnightGW

  Veteran Beastrider untaps all (or many) permanents, refreshing Dion, Bahamut's Dominant's tap activation.
• 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.).
• Conclave Cavalier

  GGWW

  Creature — Centaur KnightGW

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