Confidence:StrongSolidPlausibleTentativeSpeculative

• Tolarian Kraken

  4UU

  Creature — KrakenU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Jace, Ingenious Mind-Mage

  4UU

  Legendary Planeswalker — JaceU

  Jace, Ingenious Mind-Mage untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Aggravated Assault

  2R

  EnchantmentR

  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.
• Veteran Beastrider

  1GW

  Creature — Human KnightGW

  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.
• Intruder Alarm

  2U

  EnchantmentU

  Intruder Alarm untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Saryth, the Viper's Fang

  2GG

  Legendary Creature — Human WarlockG

  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.
• Dazzling Theater // Prop Room

  3W2W

  Enchantment — Room // Enchantment — RoomW

  Dazzling Theater untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Éomer, Marshal of Rohan

  2RR

  Legendary Creature — Human KnightR

  Éomer, Marshal of Rohan untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Ivorytusk Fortress

  2WBG

  Creature — ElephantBGW

  Ivorytusk Fortress untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Unstoppable Plan

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Plargg, Dean of Chaos // Augusta, Dean of Order

  1R2W

  Legendary Creature — Orc Shaman // Legendary Creature — Human ClericRW

  Plargg, Dean of Chaos untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Najeela, the Blade-Blossom

  2R

  Legendary Creature — Human WarriorBGRUW

  Najeela, the Blade-Blossom untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Betor, Kin to All

  2WBG

  Legendary Creature — Spirit DragonBGW

  Betor, Kin to All untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Combat Celebrant

  2R

  Creature — Human WarriorR

  Combat Celebrant untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Aurelia, the Warleader

  2RRWW

  Legendary Creature — AngelRW

  Aurelia, the Warleader untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Hapatra, the Desert Frost

  3U

  Legendary Creature — Human WizardU

  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.
• Ahn-Crop Champion

  2GW

  Creature — Human WarriorGW

  Ahn-Crop Champion untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Anzrag, the Quake-Mole

  2RG

  Legendary Creature — Mole GodGR

  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.
• Port Razer

  3RR

  Creature — Orc PirateR

  Port Razer untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Staff of Domination

  3

  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.
• DOT-7 Repair Squad

  3W

  Artifact Creature — RobotW

  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.
• Thousand-Year Elixir

  3

  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.
• Paradox Engine

  5

  Legendary ArtifactC

  Paradox Engine untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Tifa, Martial Artist

  1RGW

  Legendary Creature — Human MonkGRW

  Tifa, Martial Artist untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.
• Moraug, Fury of Akoum

  4RR

  Legendary Creature — Minotaur WarriorR

  Moraug, Fury of Akoum untaps all (or many) permanents, refreshing A-Urza, Powerstone Prodigy's tap activation.