Confidence:StrongSolidPlausibleTentativeSpeculative

• Clock of Omens

  4

  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.
• Glissa, Herald of Predation

  3BG

  Legendary Creature — Phyrexian Zombie ElfBG

  Both cards produce the same kind of effect (shared token subtype).
• Intellectual Offering

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Incubation Sac's tap activation.
• Blade Splicer

  2W

  Creature — Phyrexian Human ArtificerW

  Both cards produce the same kind of effect (shared token subtype).
• Phyrexian Awakening

  2W

  EnchantmentW

  Both cards produce the same kind of effect (shared token subtype).
• Gift of Compleation

  1B

  EnchantmentB

  Both cards produce the same kind of effect (shared token subtype).
• Unstoppable Plan

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing Incubation Sac's tap activation.
• Bloated Processor

  2B

  Creature — PhyrexianB

  Both cards produce the same kind of effect (shared token subtype).
• Master Splicer

  3W

  Creature — Phyrexian Human ArtificerW

  Both cards produce the same kind of effect (shared token subtype).
• Wing Splicer

  3U

  Creature — Phyrexian Human ArtificerU

  Both cards produce the same kind of effect (shared token subtype).
• Maul Splicer

  6G

  Creature — Phyrexian Human ArtificerG

  Both cards produce the same kind of effect (shared token subtype).
• Unwinding Clock

  4

  ArtifactC

  Unwinding Clock untaps all (or many) permanents, refreshing Incubation Sac's tap activation.
• Seedborn Muse

  3GG

  Creature — SpiritG

  Seedborn Muse untaps all (or many) permanents, refreshing Incubation Sac's tap activation.
• Innkeeper's Talent

  1G

  Enchantment — ClassG

  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.
• Darksteel Splicer

  6W

  Creature — Phyrexian ArtificerW

  Both cards produce the same kind of effect (shared token subtype).
• Essence of Orthodoxy

  3WW

  Creature — PhyrexianW

  Both cards produce the same kind of effect (shared token subtype).
• Sensor Splicer

  4W

  Creature — Phyrexian ArtificerW

  Both cards produce the same kind of effect (shared token subtype).
• Ich-Tekik, Salvage Splicer

  4G

  Legendary Creature — Phyrexian Human ArtificerG

  Both cards produce the same kind of effect (shared token subtype).
• Ekthi, Contaminator Priest

  3W

  Legendary Creature — Phyrexian ClericW

  Both cards produce the same kind of effect (shared token subtype).
• Paradox Engine

  5

  Legendary ArtifactC

  Paradox Engine untaps all (or many) permanents, refreshing Incubation Sac's tap activation.
• Dramatic Reversal

  1U

  InstantU

  Dramatic Reversal untaps all (or many) permanents, refreshing Incubation Sac's tap activation.
• Blinkmoth Infusion

  12UU

  InstantU

  Blinkmoth Infusion untaps all (or many) permanents, refreshing Incubation Sac's tap activation.
• Ezuri's Predation

  5GGG

  SorceryG

  Both cards produce the same kind of effect (shared token subtype).
• Lukka, Bound to Ruin

  2RR/G/PG

  Legendary Planeswalker — LukkaGR

  Both cards produce the same kind of effect (shared token subtype).
• General Ferrous Rokiric

  1RW

  Legendary Creature — Human SoldierRW

  Both cards produce the same kind of effect (shared token subtype).