Confidence:StrongSolidPlausibleTentativeSpeculative

• Hazel of the Rootbloom

  2BG

  Legendary Creature — Squirrel DruidBG

  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.
• Halo Fountain

  2W

  ArtifactW

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• The Legend of Kuruk // Avatar Kuruk

  2UU

  Enchantment — Saga // Legendary Creature — AvatarU

  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.
• Skystrike Officer

  2U

  Creature — Human SoldierU

  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.
• Belisarius Cawl

  2WU

  Legendary Artifact Creature — HumanUW

  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.
• Skirsdag High Priest

  1B

  Creature — Human ClericB

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

  2UU

  Creature — KrakenU

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

  1RW

  EnchantmentRW

  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.
• 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.
• Selesnya Evangel

  GW

  Creature — Elf ShamanGW

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

  2W

  Creature — Merfolk ScoutW

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Dragonbroods' Relic

  1G

  ArtifactBGRUW

  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.
• Kithkeeper

  6W

  Creature — ElementalW

  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.
• Cryptic Gateway

  5

  ArtifactC

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

  10UU

  Snow Creature — KrakenU

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Gallows at Willow Hill

  3

  ArtifactC

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

  5W

  Artifact — SpacecraftW

  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.
• Baron Helmut Zemo

  BBB

  Legendary Creature — Human Noble VillainB

  Copy chain: one card creates hasty copies of a creature whose ability or ETB the partner exploits — the canonical Kiki-Jiki / Splinter Twin pattern.
• Tinybones Joins Up

  B

  Legendary EnchantmentB

  Both cards trigger when a creature enters the battlefield — they fire together.
• Chandra, Flameshaper

  5RR

  Legendary Planeswalker — ChandraR

  Copy chain: one card creates hasty copies of a creature whose ability or ETB the partner exploits — the canonical Kiki-Jiki / Splinter Twin pattern.
• Spreading Plague

  4B

  EnchantmentB

  Both cards trigger when a creature enters the battlefield — they fire together.
• Season of Growth

  1G

  EnchantmentG

  Both cards trigger when a creature enters the battlefield — they fire together.
• Kiora, Behemoth Beckoner

  2G/U

  Legendary Planeswalker — KioraGU

  Both cards trigger when a creature enters the battlefield — they fire together.