Confidence:StrongSolidPlausibleTentativeSpeculative

• Fractal Harness

  X2G

  Artifact — EquipmentG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Study the Classics

  2G

  SorceryG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Marath, Will of the Wild

  RGW

  Legendary Creature — Elemental BeastGRW

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Brigone, Soldier of Meletis

  1W

  Legendary Creature — Human SoldierW

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Court of Garenbrig

  1GG

  EnchantmentG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Sage of Hours

  1U

  Creature — Human WizardU

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Runaway Steam-Kin

  1R

  Creature — ElementalR

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Necropotence

  BBB

  EnchantmentB

  Ozolith, the Shattered Spire has cycling, and Necropotence pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Stinkweed Imp

  2B

  Creature — ImpB

  Ozolith, the Shattered Spire has cycling, and Stinkweed Imp pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Zabaz, the Glimmerwasp

  1

  Legendary Artifact Creature — InsectRW

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Ramos, Dragon Engine

  6

  Legendary Artifact Creature — DragonBGRUW

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• The Duke, Rebel Sentry

  W

  Legendary Creature — Human Rebel AllyW

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Midnight Oil

  2BB

  EnchantmentB

  Ozolith, the Shattered Spire has cycling, and Midnight Oil pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Omnivorous Flytrap

  2G

  Creature — PlantG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Lazotep Chancellor

  UB

  Creature — Zombie WizardBU

  Ozolith, the Shattered Spire has cycling, and Lazotep Chancellor pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Gargantos, the Endbringer

  2BG

  Legendary Creature — Elder God HorrorBG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Bright-Palm, Soul Awakener

  1RGW

  Legendary Creature — Fox ShamanGRW

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Sisterhood of Karn

  1G

  Creature — ClericG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Vash, Freelance Archaeologist

  1BG

  Legendary Creature — Human Rogue ScientistBG

  Ozolith, the Shattered Spire has cycling, and Vash, Freelance Archaeologist pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.
• Karlov of the Ghost Council

  WB

  Legendary Creature — Spirit AdvisorBW

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Sazh Katzroy

  3G

  Legendary Creature — Human PilotG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Intellectual Offering

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Ozolith, the Shattered Spire's tap activation.
• Big Mother Mouser

  4

  Artifact Creature — RobotC

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Etched Oracle

  4

  Artifact Creature — WizardC

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• The Necrobloom

  1WBG

  Legendary Creature — PlantBGW

  Ozolith, the Shattered Spire has cycling, and The Necrobloom pays off whenever a card is cycled — the Astral Slide / Lightning Rift engine shape.