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.
• 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

  Token-fuel engine: one side keeps producing untapped tokens that pay the other's tap costs, and the output feeds the loop again — Squirrel Nest with Earthcraft is the classic shape.
• Voice of Resurgence

  GW

  Creature — ElementalGW

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

  1UR

  Creature — Elemental HorseRU

  Both cards produce the same kind of effect (shared token subtype).
• Omnath, Locus of Rage

  3RRGG

  Legendary Creature — ElementalGR

  Both cards produce the same kind of effect (shared token subtype).
• Mu Yanling, Sky Dancer

  1UU

  Legendary Planeswalker — YanlingU

  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 Elemental Mastery's tap activation.
• The Wandering Minstrel

  GU

  Legendary Creature — Human BardBGRUW

  Both cards produce the same kind of effect (shared token subtype).
• Zaffai, Thunder Conductor

  2UR

  Legendary Creature — Human ShamanRU

  Both cards produce the same kind of effect (shared token subtype).
• White Plume Adventurer

  2W

  Creature — Orc ClericW

  White Plume Adventurer untaps all (or many) permanents, refreshing Elemental Mastery's tap activation.
• Chandra, Acolyte of Flame

  1RR

  Legendary Planeswalker — ChandraR

  Both cards produce the same kind of effect (shared token subtype).
• Jorn, God of Winter // Kaldring, the Rimestaff

  2G1UB

  Legendary Snow Creature — God // Legendary Snow ArtifactBGU

  Jorn, God of Winter untaps all (or many) permanents, refreshing Elemental Mastery's tap activation.
• Nissa, Vastwood Seer // Nissa, Sage Animist

  2G

  Legendary Creature — Elf Scout // Legendary Planeswalker — NissaG

  Both cards produce the same kind of effect (shared token subtype).
• Valduk, Keeper of the Flame

  2R

  Legendary Creature — Human ShamanR

  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 Elemental Mastery's tap activation.
• Lagomos, Hand of Hatred

  1BR

  Legendary Creature — Human ShamanBR

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

  2G

  Creature — ElementalG

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

  2R

  EnchantmentR

  Aggravated Assault untaps all (or many) permanents, refreshing Elemental Mastery's tap activation.
• Hostility

  3RRR

  Creature — Elemental IncarnationR

  Both cards produce the same kind of effect (shared token subtype).
• Titania, Nature's Force

  4GG

  Legendary Creature — ElementalG

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

  4RR

  Legendary Planeswalker — ChandraR

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

  1R

  Creature — Human ShamanR

  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 Elemental Mastery's tap activation.
• Veteran Beastrider

  1GW

  Creature — Human KnightGW

  Veteran Beastrider untaps all (or many) permanents, refreshing Elemental Mastery's tap activation.