Confidence:StrongSolidPlausibleTentativeSpeculative

• Eladamri, Korvecdal

  1GG

  Legendary Creature — Elf WarriorG

  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.
• Nature's Chosen

  G

  Enchantment — AuraG

  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.
• Kirol, Attentive First-Year

  1R/WR/W

  Legendary Creature — Vampire ClericRW

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Tradewind Rider

  3U

  Creature — SpiritU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Caparocti Sunborn

  2RW

  Legendary Creature — Human SoldierRW

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Sky Hussar

  3WU

  Creature — Human KnightUW

  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.
• Aura of Dominion

  UU

  Enchantment — AuraU

  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.
• Copperhorn Scout

  G

  Creature — Elf ScoutG

  Copperhorn Scout untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Crackleburr

  1U/RU/R

  Creature — ElementalRU

  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.
• White Plume Adventurer

  2W

  Creature — Orc ClericW

  White Plume Adventurer untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Jace, Ingenious Mind-Mage

  4UU

  Legendary Planeswalker — JaceU

  Jace, Ingenious Mind-Mage untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Aggravated Assault

  2R

  EnchantmentR

  Aggravated Assault untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Veteran Beastrider

  1GW

  Creature — Human KnightGW

  Veteran Beastrider untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Merrow Commerce

  1U

  Kindred Enchantment — MerfolkU

  Merrow Commerce untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Intruder Alarm

  2U

  EnchantmentU

  Intruder Alarm untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Drumbellower

  2W

  Creature — SpiritW

  Drumbellower untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Gideon, Martial Paragon

  4W

  Legendary Planeswalker — GideonW

  Gideon, Martial Paragon untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Deepway Navigator

  WU

  Creature — Merfolk WizardUW

  Deepway Navigator untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Dazzling Theater // Prop Room

  3W2W

  Enchantment — Room // Enchantment — RoomW

  Dazzling Theater untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Intellectual Offering

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Prophet of Kruphix

  3GU

  Creature — Human WizardGU

  Prophet of Kruphix untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Éomer, Marshal of Rohan

  2RR

  Legendary Creature — Human KnightR

  Éomer, Marshal of Rohan untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Ivorytusk Fortress

  2WBG

  Creature — ElephantBGW

  Ivorytusk Fortress untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Unstoppable Plan

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing Merrow Bonegnawer's tap activation.
• Song of the Worldsoul

  4WW

  EnchantmentW

  Both cards trigger when you cast a spell — they fire together.