Confidence:StrongSolidPlausibleTentativeSpeculative

• Derevi, Empyrial Tactician

  GWU

  Legendary Creature — Bird WizardGUW

  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.
• Pestermite

  2U

  Creature — Faerie RogueU

  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.
• Giant-Sized Flying Ant

  3U

  Creature — InsectU

  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.
• Intellectual Offering

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Grimoire of the Dead's tap activation.
• Unstoppable Plan

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing Grimoire of the Dead's tap activation.
• Seedborn Muse

  3GG

  Creature — SpiritG

  Seedborn Muse untaps all (or many) permanents, refreshing Grimoire of the Dead's tap activation.
• Unwinding Clock

  4

  ArtifactC

  Unwinding Clock untaps all (or many) permanents, refreshing Grimoire of the Dead'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.
• Paradox Engine

  5

  Legendary ArtifactC

  Paradox Engine untaps all (or many) permanents, refreshing Grimoire of the Dead's tap activation.
• Dramatic Reversal

  1U

  InstantU

  Dramatic Reversal untaps all (or many) permanents, refreshing Grimoire of the Dead's tap activation.
• Agrus Kos, Spirit of Justice

  2RW

  Legendary Creature — Spirit DetectiveRW

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Agrus Kos, Spirit of Justice's enter-the-battlefield effect.
• Nicol Bolas, the Ravager // Nicol Bolas, the Arisen

  1UBR

  Legendary Creature — Elder Dragon // Legendary Planeswalker — BolasBRU

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Nicol Bolas, the Ravager's enter-the-battlefield effect.
• Phlage, Titan of Fire's Fury

  1RW

  Legendary Creature — Elder GiantRW

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Phlage, Titan of Fire's Fury's enter-the-battlefield effect.
• Tinybones Joins Up

  B

  Legendary EnchantmentB

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Tinybones Joins Up's enter-the-battlefield effect.
• Spreading Plague

  4B

  EnchantmentB

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Spreading Plague's enter-the-battlefield effect.
• Season of Growth

  1G

  EnchantmentG

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Season of Growth's enter-the-battlefield effect.
• Serene Sleuth

  1W

  Creature — Human DetectiveW

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Serene Sleuth's enter-the-battlefield effect.
• Bebop, Skull & Crossbones

  1B

  Legendary Creature — Boar MutantB

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Bebop, Skull & Crossbones's enter-the-battlefield effect.
• Bruse Tarl, Roving Rancher

  2RW

  Legendary Creature — Human WarriorRW

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Bruse Tarl, Roving Rancher's enter-the-battlefield effect.
• Headliner Scarlett

  3R

  Legendary Creature — Human WarlockR

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Headliner Scarlett's enter-the-battlefield effect.
• Wildfire Devils

  3R

  Creature — DevilR

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Wildfire Devils's enter-the-battlefield effect.
• Solitude

  3WW

  Creature — Elemental IncarnationW

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Solitude's enter-the-battlefield effect.
• Orcish Bowmasters

  1B

  Creature — Orc ArcherB

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Orcish Bowmasters's enter-the-battlefield effect.
• Thassa's Oracle

  UU

  Creature — Merfolk WizardU

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Thassa's Oracle's enter-the-battlefield effect.
• Regal Sliver

  3W

  Creature — SliverW

  Grimoire of the Dead returns creatures from the graveyard to the battlefield, re-firing Regal Sliver's enter-the-battlefield effect.