Confidence:StrongSolidPlausibleTentativeSpeculative

• Baron Helmut Zemo

  BBB

  Legendary Creature — Human Noble VillainB

  Kefnet the Mindful bounces a permanent, enabling Baron Helmut Zemo's recast / spell-cast trigger.
• Song of Creation

  1GUR

  EnchantmentGRU

  Kefnet the Mindful bounces a permanent, enabling Song of Creation's recast / spell-cast trigger.
• Shanid, Sleepers' Scourge

  1RWB

  Legendary Creature — Human KnightBRW

  Kefnet the Mindful bounces a permanent, enabling Shanid, Sleepers' Scourge's recast / spell-cast trigger.
• Hydro-Man, Fluid Felon

  UU

  Legendary Creature — Elemental VillainU

  Kefnet the Mindful bounces a permanent, enabling Hydro-Man, Fluid Felon's recast / spell-cast trigger.
• Jodah, the Unifier

  WUBRG

  Legendary Creature — Human WizardBGRUW

  Kefnet the Mindful bounces a permanent, enabling Jodah, the Unifier's recast / spell-cast trigger.
• Aetherflux Reservoir

  4

  ArtifactC

  Kefnet the Mindful bounces a permanent, enabling Aetherflux Reservoir's recast / spell-cast trigger.
• Innocuous Researcher

  3G

  Creature — Centaur DetectiveG

  Innocuous Researcher untaps lands, fueling Kefnet the Mindful's mana-hungry effect.
• Fiery Gambit

  2R

  SorceryR

  Fiery Gambit untaps lands, fueling Kefnet the Mindful's mana-hungry effect.
• Stella Lee, Wild Card

  1UR

  Legendary Creature — Human RogueRU

  Kefnet the Mindful bounces a permanent, enabling Stella Lee, Wild Card's recast / spell-cast trigger.
• Malcolm, the Eyes

  UR

  Legendary Creature — Siren PirateRU

  Kefnet the Mindful bounces a permanent, enabling Malcolm, the Eyes's recast / spell-cast trigger.
• Questing Druid // Seek the Beast

  1G1R

  Creature — Human Druid // Instant — AdventureGR

  Kefnet the Mindful bounces a permanent, enabling Questing Druid's recast / spell-cast trigger.
• Reki, the History of Kamigawa

  2G

  Legendary Creature — Human ShamanG

  Kefnet the Mindful bounces a permanent, enabling Reki, the History of Kamigawa's recast / spell-cast trigger.
• Infernal Sovereign

  4BB

  Creature — DemonB

  Kefnet the Mindful bounces a permanent, enabling Infernal Sovereign's recast / spell-cast trigger.
• Deathbringer Liege

  2W/BW/BW/B

  Creature — HorrorBW

  Kefnet the Mindful bounces a permanent, enabling Deathbringer Liege's recast / spell-cast trigger.
• Time Spiral

  4UU

  SorceryU

  Time Spiral untaps lands, fueling Kefnet the Mindful's mana-hungry effect.
• Nissa, Vastwood Seer // Nissa, Sage Animist

  2G

  Legendary Creature — Elf Scout // Legendary Planeswalker — NissaG

  Nissa, Vastwood Seer untaps lands, fueling Kefnet the Mindful's mana-hungry effect.
• The Circle of Loyalty

  4WW

  Legendary ArtifactW

  Kefnet the Mindful bounces a permanent, enabling The Circle of Loyalty's recast / spell-cast trigger.
• Moderation

  1WU

  EnchantmentUW

  Kefnet the Mindful bounces a permanent, enabling Moderation's recast / spell-cast trigger.
• Merrow Bonegnawer

  B

  Creature — Merfolk RogueB

  Kefnet the Mindful bounces a permanent, enabling Merrow Bonegnawer's recast / spell-cast trigger.
• Neerdiv, Devious Diver

  2U

  Legendary Creature — Merfolk RogueU

  Kefnet the Mindful bounces a permanent, enabling Neerdiv, Devious Diver's recast / spell-cast trigger.
• Venat, Heart of Hydaelyn // Hydaelyn, the Mothercrystal

  1WW

  Legendary Creature — Elder Wizard // Legendary Creature — GodW

  Kefnet the Mindful bounces a permanent, enabling Venat, Heart of Hydaelyn's recast / spell-cast trigger.
• Norin the Wary

  R

  Legendary Creature — Human WarriorR

  Kefnet the Mindful bounces a permanent, enabling Norin the Wary's recast / spell-cast trigger.
• Urianger Augurelt

  WU

  Legendary Creature — Elf AdvisorUW

  Kefnet the Mindful bounces a permanent, enabling Urianger Augurelt's recast / spell-cast trigger.
• Elrond, Moon-Reader

  2U

  Legendary Creature — Elf NobleU

  Kefnet the Mindful has activated abilities that aren't mana abilities, fueling Elrond, Moon-Reader's activation-trigger.
• Ant-Man, Reformed Rogue

  2G/U

  Legendary Creature — Human Rogue HeroGU

  Kefnet the Mindful bounces a permanent, enabling Ant-Man, Reformed Rogue's recast / spell-cast trigger.