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.
• Tetzin, Gnome Champion // The Golden-Gear Colossus

  URW

  Legendary Artifact Creature — Gnome // Legendary Artifact Creature — GnomeRUW

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

  4U

  InstantU

  Intellectual Offering untaps all (or many) permanents, refreshing Metrognome's tap activation.
• Unstoppable Plan

  2U

  EnchantmentU

  Unstoppable Plan untaps all (or many) permanents, refreshing Metrognome's tap activation.
• Seedborn Muse

  3GG

  Creature — SpiritG

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

  4

  ArtifactC

  Unwinding Clock untaps all (or many) permanents, refreshing Metrognome's tap activation.
• Threefold Thunderhulk

  7

  Artifact Creature — GnomeC

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

  5

  Legendary ArtifactC

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

  1U

  InstantU

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

  12UU

  InstantU

  Blinkmoth Infusion untaps all (or many) permanents, refreshing Metrognome's tap activation.
• Nath of the Gilt-Leaf

  3BG

  Legendary Creature — Elf WarriorBG

  Both cards trigger when a card is discarded — they fire together.
• Tinybones, Bauble Burglar

  1B

  Legendary Creature — Skeleton RogueB

  Both cards trigger when a card is discarded — they fire together.
• Waste Not

  1B

  EnchantmentB

  Both cards trigger when a card is discarded — they fire together.
• Aclazotz, Deepest Betrayal // Temple of the Dead

  3BB

  Legendary Creature — Bat God // LandB

  Both cards trigger when a card is discarded — they fire together.
• Insidious Roots

  BG

  EnchantmentBG

  Both cards trigger when a card is discarded — they fire together.
• Oltec Matterweaver

  2W

  Creature — Human ArtificerW

  Both cards produce the same kind of effect (shared token subtype).
• The Ancient One

  UB

  Legendary Creature — Spirit GodBU

  Both cards trigger when a card is discarded — they fire together.
• Thousand Moons Smithy // Barracks of the Thousand

  2WW

  Legendary Artifact // Legendary Artifact LandW

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

  4W

  Artifact Creature — GolemW

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

  3B

  Artifact — SpacecraftB

  Both cards trigger when a card is discarded — they fire together.
• Clay-Fired Bricks // Cosmium Kiln

  1W

  Artifact // ArtifactW

  Both cards produce the same kind of effect (shared token subtype).
• Tergrid, God of Fright // Tergrid's Lantern

  3BB3B

  Legendary Creature — God // Legendary ArtifactB

  Both cards trigger when a card is discarded — they fire together.
• Spiritual Focus

  1W

  EnchantmentW

  Both cards trigger when a card is discarded — they fire together.
• Fell Specter

  3B

  Creature — SpecterB

  Both cards trigger when a card is discarded — they fire together.
• Erebos's Titan

  1BBB

  Creature — GiantB

  Both cards trigger when a card is discarded — they fire together.