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 Erratic Portal's tap activation.
• Unstoppable Plan

  2U

  EnchantmentU

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

  3GG

  Creature — SpiritG

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

  4

  ArtifactC

  Unwinding Clock untaps all (or many) permanents, refreshing Erratic Portal'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.
• Dramatic Reversal

  1U

  InstantU

  Dramatic Reversal untaps all (or many) permanents, refreshing Erratic Portal's tap activation.
• Blinkmoth Infusion

  12UU

  InstantU

  Blinkmoth Infusion untaps all (or many) permanents, refreshing Erratic Portal's tap activation.
• Agrus Kos, Spirit of Justice

  2RW

  Legendary Creature — Spirit DetectiveRW

  Erratic Portal 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

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

  1RW

  Legendary Creature — Elder GiantRW

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

  1W

  Creature — Human DetectiveW

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

  1B

  Legendary Creature — Boar MutantB

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

  2RW

  Legendary Creature — Human WarriorRW

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

  3R

  Legendary Creature — Human WarlockR

  Erratic Portal bounces a permanent, enabling Headliner Scarlett's recast / spell-cast trigger.
• Wildfire Devils

  3R

  Creature — DevilR

  Erratic Portal bounces a permanent, enabling Wildfire Devils's recast / spell-cast trigger.
• Solitude

  3WW

  Creature — Elemental IncarnationW

  Erratic Portal bounces a permanent, enabling Solitude's recast / spell-cast trigger.
• Orcish Bowmasters

  1B

  Creature — Orc ArcherB

  Erratic Portal bounces a permanent, enabling Orcish Bowmasters's recast / spell-cast trigger.
• Thassa's Oracle

  UU

  Creature — Merfolk WizardU

  Erratic Portal bounces a permanent, enabling Thassa's Oracle's recast / spell-cast trigger.
• Regal Sliver

  3W

  Creature — SliverW

  Erratic Portal bounces a permanent, enabling Regal Sliver's recast / spell-cast trigger.
• Odric, Blood-Cursed

  1RW

  Legendary Creature — Vampire SoldierRW

  Erratic Portal bounces a permanent, enabling Odric, Blood-Cursed's recast / spell-cast trigger.
• Uro, Titan of Nature's Wrath

  1GU

  Legendary Creature — Elder GiantGU

  Erratic Portal bounces a permanent, enabling Uro, Titan of Nature's Wrath's recast / spell-cast trigger.