Confidence:StrongSolidPlausibleTentativeSpeculative

• Esper Sojourners

  WUB

  Artifact Creature — Vedalken WizardBUW

  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.
• Preacher of the Schism

  2B

  Creature — Vampire ClericB

  Both cards produce the same kind of effect (shared token subtype).
• Bloodline Keeper // Lord of Lineage

  2BB

  Creature — Vampire // Creature — VampireB

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

  2BB

  Legendary Planeswalker — SorinB

  Both cards produce the same kind of effect (shared token subtype).
• Promise of Aclazotz // Foul Rebirth

  1B2B

  Enchantment // Sorcery — AdventureB

  Both cards produce the same kind of effect (shared token subtype).
• Sorin, Lord of Innistrad

  2WB

  Legendary Planeswalker — SorinBW

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

  1G

  Creature — BoarG

  Lifegain pair: one card gains life while the other rewards lifegain. They reinforce each other in a lifegain deck.
• Sorin, Grim Nemesis

  4WB

  Legendary Planeswalker — SorinBW

  Both cards produce the same kind of effect (shared token subtype).
• Legion's Landing // Adanto, the First Fort

  W

  Legendary Enchantment // Legendary LandW

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

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Glass-Cast Heart's tap activation.
• Sorin, Solemn Visitor

  2WB

  Legendary Planeswalker — SorinBW

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

  XWW

  EnchantmentW

  Both cards produce the same kind of effect (shared token subtype).
• Baron Bertram Graywater

  2WB

  Legendary Creature — Vampire NobleBW

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

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing Glass-Cast Heart's tap activation.
• Charismatic Conqueror

  1W

  Creature — Vampire SoldierW

  Both cards produce the same kind of effect (shared token subtype).
• Call to the Feast

  2WB

  SorceryBW

  Both cards produce the same kind of effect (shared token subtype).
• Elenda and Azor

  3WUB

  Legendary Creature — Vampire Knight SphinxBUW

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

  1W

  Creature — Vampire SoldierW

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

  3

  Legendary ArtifactC

  Lifegain pair: one card gains life while the other rewards lifegain. They reinforce each other in a lifegain deck.
• Elenda's Hierophant

  2W

  Creature — Vampire ClericW

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

  4

  ArtifactC

  Unwinding Clock untaps all (or many) permanents, refreshing Glass-Cast Heart's tap activation.
• Seedborn Muse

  3GG

  Creature — SpiritG

  Seedborn Muse untaps all (or many) permanents, refreshing Glass-Cast Heart's tap activation.
• Squire's Devotion

  2W

  Enchantment — AuraW

  Both cards produce the same kind of effect (shared token subtype).
• Kalitas, Bloodchief of Ghet

  5BB

  Legendary Creature — Vampire WarriorB

  Both cards produce the same kind of effect (shared token subtype).
• Edgar, Charmed Groom // Edgar Markov's Coffin

  2WB

  Legendary Creature — Vampire Noble // Legendary ArtifactBW

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