Confidence:StrongSolidPlausibleTentativeSpeculative

• Grand Architect✓

  1UU

  Creature — Vedalken ArtificerU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Urza, Lord High Artificer✓

  2UU

  Legendary Creature — Human ArtificerU

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

  1U

  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.
• Glare of Subdual

  2GW

  EnchantmentGW

  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.
• Opposition

  2UU

  EnchantmentU

  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.
• Sandsower

  3W

  Creature — SpiritW

  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.
• Diversionary Tactics

  3W

  EnchantmentW

  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.
• Hazel of the Rootbloom

  2BG

  Legendary Creature — Squirrel DruidBG

  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.
• Prosperous Partnership

  1RW

  EnchantmentRW

  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.
• Mr. House, President and CEO

  RWB

  Legendary Artifact Creature — HumanBRW

  Mana loop: net-positive mana cycle between the two cards.
• Currency Converter

  1

  ArtifactC

  Mana loop: net-positive mana cycle between the two cards.
• Wizard's Rockets

  1

  ArtifactC

  Mana loop: net-positive mana cycle between the two cards.
• Reckless Lackey

  R

  Creature — Goblin PirateR

  Mana loop: net-positive mana cycle between the two cards.
• Ashnod, Flesh Mechanist

  B

  Legendary Creature — Human ArtificerB

  Mana loop: net-positive mana cycle between the two cards.
• Meria, Scholar of Antiquity

  1RG

  Legendary Creature — Elf ArtificerGR

  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.
• Thassa, Deep-Dwelling

  3U

  Legendary Enchantment Creature — GodU

  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.
• Petalmane Baku

  1G

  Creature — SpiritG

  Mana loop: net-positive mana cycle between the two cards.
• Baylen, the Haymaker

  RGW

  Legendary Creature — Rabbit WarriorGRW

  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.
• Elemental Masterpiece

  5UR

  SorceryRU

  Mana loop: net-positive mana cycle between the two cards.
• Fain, the Broker

  2B

  Legendary Creature — Human WarlockB

  Mana loop: net-positive mana cycle between the two cards.
• Nykthos, Shrine to Nyx

  Legendary LandC

  Mana loop: net-positive mana cycle between the two cards.
• Honor-Worn Shaku

  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.
• Tavern Scoundrel

  1R

  Creature — Human RogueR

  Mana loop: net-positive mana cycle between the two cards.
• Gideon's Lawkeeper

  W

  Creature — Human SoldierW

  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.
• Goldmeadow Harrier

  W

  Creature — Kithkin SoldierW

  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.