Confidence:StrongSolidPlausibleTentativeSpeculative

• Goblin Engineer

  1R

  Creature — Goblin ArtificerR

  Sacrifice-recursion with a catch: one card can return the other from the graveyard, but the return ability has an extra cost (sacrificing another creature, discarding a card, or tapping with no way to untap) the pair can't pay by itself. It works once — something else must keep supplying the fodder to make it repeatable.
• Auriok Salvagers

  3W

  Creature — Human SoldierW

  Sacrifice-recursion engine: one card repeatedly returns the other from the graveyard, and the returned card sacrifices itself again for value — the Auriok Salvagers + Black Lotus shape.
• Argivian Archaeologist

  1WW

  Creature — Human ArtificerW

  Sacrifice-recursion with a catch: one card can return the other from the graveyard, but the return ability has an extra cost (sacrificing another creature, discarding a card, or tapping with no way to untap) the pair can't pay by itself. It works once — something else must keep supplying the fodder to make it repeatable.
• Trading Post

  4

  ArtifactC

  Sacrifice-recursion with a catch: one card can return the other from the graveyard, but the return ability has an extra cost (sacrificing another creature, discarding a card, or tapping with no way to untap) the pair can't pay by itself. It works once — something else must keep supplying the fodder to make it repeatable.
• Shuri's Fabricator

  4

  ArtifactC

  Sacrifice-recursion with a catch: one card can return the other from the graveyard, but the return ability has an extra cost (sacrificing another creature, discarding a card, or tapping with no way to untap) the pair can't pay by itself. It works once — something else must keep supplying the fodder to make it repeatable.
• Jenson Carthalion, Druid Exile

  GW

  Legendary Creature — Human DruidBGRUW

  Mana loop: net-positive mana cycle between the two cards.
• Grim Monolith

  2

  ArtifactC

  Mana loop: net-positive mana cycle between the two cards.
• Instrument of the Bards

  G

  Legendary ArtifactG

  Mana loop: net-positive mana cycle between the two cards.
• Thornvault Forager

  1G

  Creature — Squirrel RangerG

  Mana loop: net-positive mana cycle between the two cards.
• Intrepid Paleontologist

  1G

  Creature — Human DruidG

  Mana loop: net-positive mana cycle between the two cards.
• Fanatic of Rhonas

  1G

  Creature — Snake DruidG

  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.
• Avatar Roku, Firebender

  3RRR

  Legendary Creature — Human AvatarR

  Mana loop: net-positive mana cycle between the two cards.
• Mr. House, President and CEO

  RWB

  Legendary Artifact Creature — HumanBRW

  Mana loop: net-positive mana cycle between the two cards.
• Pit Automaton

  2

  Artifact Creature — ConstructC

  Mana loop: net-positive mana cycle between the two cards.
• Basalt Monolith

  3

  ArtifactC

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

  1

  ArtifactC

  Mana loop: net-positive mana cycle between the two cards.
• Deathrite Shaman

  B/G

  Creature — Elf ShamanBG

  Mana loop: net-positive mana cycle between the two cards.
• Loot, the Pathfinder

  2GUR

  Legendary Creature — Beast NobleGRU

  Mana loop: net-positive mana cycle between the two cards.
• Tinder Wall

  G

  Creature — Plant WallGR

  Mana loop: net-positive mana cycle between the two cards.
• Stark Industries Executive

  R

  Creature — Human AdvisorR

  Mana loop: net-positive mana cycle between the two cards.
• Renowned Weaponsmith

  1U

  Creature — Human ArtificerU

  Mana loop: net-positive mana cycle between the two cards.
• Gilded Goose

  G

  Creature — BirdG

  Mana loop: net-positive mana cycle between the two cards.
• Simic Cluestone

  3

  ArtifactGU

  Mana loop: net-positive mana cycle between the two cards.
• The Soul Stone

  1B

  Legendary Artifact — Infinity StoneB

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