Confidence:StrongSolidPlausibleTentativeSpeculative

• Trickster Mage

  U

  Creature — Human SpellshaperU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Mind Over Matter

  2UUUU

  EnchantmentU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Derevi, Empyrial Tactician

  GWU

  Legendary Creature — Bird WizardGUW

  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.
• Intellectual Offering

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Obelisk of Undoing's tap activation.
• Unstoppable Plan

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing Obelisk of Undoing's tap activation.
• Seedborn Muse

  3GG

  Creature — SpiritG

  Seedborn Muse untaps all (or many) permanents, refreshing Obelisk of Undoing's tap activation.
• Unwinding Clock

  4

  ArtifactC

  Unwinding Clock untaps all (or many) permanents, refreshing Obelisk of Undoing's tap activation.
• Pestermite

  2U

  Creature — Faerie RogueU

  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.
• Giant-Sized Flying Ant

  3U

  Creature — InsectU

  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.
• 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 Obelisk of Undoing'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 Obelisk of Undoing's tap activation.
• Agrus Kos, Spirit of Justice

  2RW

  Legendary Creature — Spirit DetectiveRW

  Obelisk of Undoing bounces a permanent, enabling Agrus Kos, Spirit of Justice's recast / spell-cast trigger.
• Nicol Bolas, the Ravager // Nicol Bolas, the Arisen

  1UBR

  Legendary Creature — Elder Dragon // Legendary Planeswalker — BolasBRU

  Obelisk of Undoing bounces a permanent, enabling Nicol Bolas, the Ravager's recast / spell-cast trigger.
• Phlage, Titan of Fire's Fury

  1RW

  Legendary Creature — Elder GiantRW

  Obelisk of Undoing bounces a permanent, enabling Phlage, Titan of Fire's Fury's recast / spell-cast trigger.
• Serene Sleuth

  1W

  Creature — Human DetectiveW

  Obelisk of Undoing bounces a permanent, enabling Serene Sleuth's recast / spell-cast trigger.
• Bebop, Skull & Crossbones

  1B

  Legendary Creature — Boar MutantB

  Obelisk of Undoing bounces a permanent, enabling Bebop, Skull & Crossbones's recast / spell-cast trigger.
• Bruse Tarl, Roving Rancher

  2RW

  Legendary Creature — Human WarriorRW

  Obelisk of Undoing bounces a permanent, enabling Bruse Tarl, Roving Rancher's recast / spell-cast trigger.
• Headliner Scarlett

  3R

  Legendary Creature — Human WarlockR

  Obelisk of Undoing bounces a permanent, enabling Headliner Scarlett's recast / spell-cast trigger.
• Wildfire Devils

  3R

  Creature — DevilR

  Obelisk of Undoing bounces a permanent, enabling Wildfire Devils's recast / spell-cast trigger.