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.
• Tolarian Kraken

  4UU

  Creature — KrakenU

  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.
• Kemba, Kha Regent

  1WW

  Legendary Creature — Cat ClericW

  Both cards produce the same kind of effect (shared token subtype).
• Ajani, Nacatl Pariah // Ajani, Nacatl Avenger

  1W

  Legendary Creature — Cat Warrior // Legendary Planeswalker — AjaniRW

  Both cards produce the same kind of effect (shared token subtype).
• Norman Osborn // Green Goblin

  1U1UBR

  Legendary Creature — Human Scientist Villain // Legendary Creature — Goblin Human VillainBRU

  Basri, Tomorrow's Champion has cycling, and Norman Osborn pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Tinybones, Trinket Thief

  1B

  Legendary Creature — Skeleton RogueB

  Basri, Tomorrow's Champion has cycling, and Tinybones, Trinket Thief pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Wasitora, Nekoru Queen

  2BRG

  Legendary Creature — Cat DragonBGR

  Both cards produce the same kind of effect (shared token subtype).
• Teferi, Temporal Pilgrim

  3UU

  Legendary Planeswalker — TeferiU

  Basri, Tomorrow's Champion has cycling, and Teferi, Temporal Pilgrim pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Copperhorn Scout

  G

  Creature — Elf ScoutG

  Copperhorn Scout untaps all (or many) permanents, refreshing Basri, Tomorrow's Champion's tap activation.
• Ajani, Strength of the Pride

  2WW

  Legendary Planeswalker — AjaniW

  Both cards produce the same kind of effect (shared token subtype).
• Ob Nixilis Reignited

  3BB

  Legendary Planeswalker — NixilisB

  Basri, Tomorrow's Champion has cycling, and Ob Nixilis Reignited pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Emerald Collector

  1U

  Creature — Human PirateGU

  Basri, Tomorrow's Champion has cycling, and Emerald Collector pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Leonin Warleader

  2WW

  Creature — Cat SoldierW

  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 Basri, Tomorrow's Champion's tap activation.
• Red Ghost, Intangible Genius

  2UR

  Legendary Creature — Human Scientist VillainRU

  Basri, Tomorrow's Champion has cycling, and Red Ghost, Intangible Genius pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Stinkweed Imp

  2B

  Creature — ImpB

  Basri, Tomorrow's Champion has cycling, and Stinkweed Imp pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• The Rise of Sozin // Fire Lord Sozin

  4BB

  Enchantment — Saga // Legendary Creature — Human NobleB

  Basri, Tomorrow's Champion has cycling, and The Rise of Sozin pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Sheoldred, the Apocalypse

  2BB

  Legendary Creature — Phyrexian PraetorB

  Basri, Tomorrow's Champion has cycling, and Sheoldred, the Apocalypse pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Jace, Ingenious Mind-Mage

  4UU

  Legendary Planeswalker — JaceU

  Jace, Ingenious Mind-Mage untaps all (or many) permanents, refreshing Basri, Tomorrow's Champion's tap activation.
• Kid Loki

  U

  Legendary Creature — God Hero VillainU

  Basri, Tomorrow's Champion has cycling, and Kid Loki pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Brimaz, King of Oreskos

  1WW

  Legendary Creature — Cat SoldierW

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

  2R

  EnchantmentR

  Aggravated Assault untaps all (or many) permanents, refreshing Basri, Tomorrow's Champion's tap activation.
• Midnight Oil

  2BB

  EnchantmentB

  Basri, Tomorrow's Champion has cycling, and Midnight Oil pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.