Confidence:StrongSolidPlausibleTentativeSpeculative

• Intellectual Offering

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Ice Cauldron's tap activation.
• Unstoppable Plan

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing Ice Cauldron's tap activation.
• Seedborn Muse

  3GG

  Creature — SpiritG

  Seedborn Muse untaps all (or many) permanents, refreshing Ice Cauldron's tap activation.
• Unwinding Clock

  4

  ArtifactC

  Unwinding Clock untaps all (or many) permanents, refreshing Ice Cauldron's tap activation.
• Paradox Engine

  5

  Legendary ArtifactC

  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.
• Dramatic Reversal

  1U

  InstantU

  Dramatic Reversal untaps all (or many) permanents, refreshing Ice Cauldron's tap activation.
• Hematite Talisman

  2

  ArtifactC

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Lapis Lazuli Talisman

  2

  ArtifactC

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Malachite Talisman

  2

  ArtifactC

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Nacre Talisman

  2

  ArtifactC

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Onyx Talisman

  2

  ArtifactC

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Blinkmoth Infusion

  12UU

  InstantU

  Blinkmoth Infusion untaps all (or many) permanents, refreshing Ice Cauldron's tap activation.
• Innkeeper's Talent

  1G

  Enchantment — ClassG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Baron Helmut Zemo

  BBB

  Legendary Creature — Human Noble VillainB

  Ice Cauldron lets you cast/play from exile, enabling Baron Helmut Zemo's exile-recursion loop.
• Song of Creation

  1GUR

  EnchantmentGRU

  Ice Cauldron lets you cast/play from exile, enabling Song of Creation's exile-recursion loop.
• Shanid, Sleepers' Scourge

  1RWB

  Legendary Creature — Human KnightBRW

  Ice Cauldron lets you cast/play from exile, enabling Shanid, Sleepers' Scourge's exile-recursion loop.
• Hydro-Man, Fluid Felon

  UU

  Legendary Creature — Elemental VillainU

  Ice Cauldron lets you cast/play from exile, enabling Hydro-Man, Fluid Felon's exile-recursion loop.
• Jodah, the Unifier

  WUBRG

  Legendary Creature — Human WizardBGRUW

  Ice Cauldron lets you cast/play from exile, enabling Jodah, the Unifier's exile-recursion loop.
• Aetherflux Reservoir

  4

  ArtifactC

  Ice Cauldron lets you cast/play from exile, enabling Aetherflux Reservoir's exile-recursion loop.
• Malicious Affliction

  BB

  InstantB

  Ice Cauldron lets you cast/play from exile, enabling Malicious Affliction's exile-recursion loop.
• Stella Lee, Wild Card

  1UR

  Legendary Creature — Human RogueRU

  Ice Cauldron lets you cast/play from exile, enabling Stella Lee, Wild Card's exile-recursion loop.
• Dash Hopes

  BB

  InstantB

  Ice Cauldron lets you cast/play from exile, enabling Dash Hopes's exile-recursion loop.
• Malcolm, the Eyes

  UR

  Legendary Creature — Siren PirateRU

  Ice Cauldron lets you cast/play from exile, enabling Malcolm, the Eyes's exile-recursion loop.
• Questing Druid // Seek the Beast

  1G1R

  Creature — Human Druid // Instant — AdventureGR

  Ice Cauldron lets you cast/play from exile, enabling Questing Druid's exile-recursion loop.
• Reki, the History of Kamigawa

  2G

  Legendary Creature — Human ShamanG

  Ice Cauldron lets you cast/play from exile, enabling Reki, the History of Kamigawa's exile-recursion loop.