Confidence:StrongSolidPlausibleTentativeSpeculative

• 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).
• Threefold Thunderhulk

  7

  Artifact Creature — GnomeC

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

  2W

  Creature — Human ArtificerW

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

  4

  ArtifactC

  Both cards produce the same kind of effect (shared token subtype).
• Clay-Fired Bricks // Cosmium Kiln

  1W

  Artifact // ArtifactW

  Both cards produce the same kind of effect (shared token subtype).
• Anim Pakal, Thousandth Moon

  1RW

  Legendary Creature — Human SoldierRW

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

  1G

  Creature — Elf DruidG

  Refuel loop: one card's payoff untaps your lands, paying for the other's activation again — repeatable every turn, and often infinite.
• Tinker's Tote

  2W

  ArtifactW

  Both cards produce the same kind of effect (shared token subtype).
• Oltec Cloud Guard

  3W

  Creature — Human SoldierW

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

  3G

  Creature — Centaur DetectiveG

  Innocuous Researcher untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Fiery Gambit

  2R

  SorceryR

  Fiery Gambit untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Time Spiral

  4UU

  SorceryU

  Time Spiral untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Nissa, Vastwood Seer // Nissa, Sage Animist

  2G

  Legendary Creature — Elf Scout // Legendary Planeswalker — NissaG

  Nissa, Vastwood Seer untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Elrond, Moon-Reader

  2U

  Legendary Creature — Elf NobleU

  Envoy of Okinec Ahau has activated abilities that aren't mana abilities, fueling Elrond, Moon-Reader's activation-trigger.
• Nissa, Worldwaker

  3GG

  Legendary Planeswalker — NissaG

  Nissa, Worldwaker untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Rewind

  2UU

  InstantU

  Rewind untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Prophet of Kruphix

  3GU

  Creature — Human WizardGU

  Prophet of Kruphix untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Bumi, Unleashed

  3RG

  Legendary Creature — Human Noble AllyGR

  Bumi, Unleashed untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Finale of Revelation

  XUU

  SorceryU

  Finale of Revelation untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Zacama, Primal Calamity

  6RGW

  Legendary Creature — Elder DinosaurGRW

  Zacama, Primal Calamity untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Sphinx of the Second Sun

  6UU

  Creature — SphinxU

  Sphinx of the Second Sun untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Wilderness Reclamation

  3G

  EnchantmentG

  Wilderness Reclamation untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.
• Sword of Feast and Famine

  3

  Artifact — EquipmentC

  Sword of Feast and Famine untaps lands, fueling Envoy of Okinec Ahau's mana-hungry effect.