Confidence:StrongSolidPlausibleTentativeSpeculative

• Unearth

  B

  SorceryB

  Unearth has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Flame Blitz

  R

  EnchantmentR

  Flame Blitz has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Jolted Awake

  W

  SorceryW

  Jolted Awake has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Decree of Annihilation

  8RR

  SorceryR

  Decree of Annihilation has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Vedalken Aethermage

  1U

  Creature — Vedalken WizardU

  Vedalken Aethermage has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Decree of Pain

  6BB

  SorceryB

  Decree of Pain has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Elvish Aberration

  5G

  Creature — Elf MutantG

  Elvish Aberration has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Neutralize

  1UU

  InstantU

  Neutralize has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Resounding Thunder

  2R

  InstantBGR

  Resounding Thunder has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Boon of the Wish-Giver

  4UU

  SorceryU

  Boon of the Wish-Giver has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Spectacular Pileup

  3WW

  SorceryW

  Spectacular Pileup has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Webstrike Elite

  GG

  Creature — Insect ArcherG

  Webstrike Elite has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Intimidation Tactics

  B

  SorceryB

  Intimidation Tactics has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Voltaic Key

  1

  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.
• Lórien Revealed

  3UU

  SorceryU

  Lórien Revealed has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Dismissive Denial

  2UU

  InstantU

  Dismissive Denial has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Borough Backup

  4W

  SorceryW

  Borough Backup has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Migratory Route

  3WU

  SorceryUW

  Migratory Route has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Viashino Sandsprinter

  1RR

  Creature — Lizard WarriorR

  Viashino Sandsprinter has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Akroma's Vengeance

  4WW

  SorceryW

  Akroma's Vengeance has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Pest Control

  WB

  SorceryBW

  Pest Control has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• The Locust God

  4UR

  Legendary Creature — GodRU

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• Intellectual Offering

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Currency Converter's tap activation.
• Unpredictable Cyclone

  3RR

  EnchantmentR

  Unpredictable Cyclone has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Easy Prey

  1B

  InstantB

  Easy Prey has cycling, and Currency Converter pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.