Confidence:StrongSolidPlausibleTentativeSpeculative

• Mila, Crafty Companion // Lukka, Wayward Bonder

  1WW4RR

  Legendary Creature — Fox // Legendary Planeswalker — LukkaRW

  Both cards blink (exile-and-return) creatures — their effects stack.
• Mirrorhall Mimic // Ghastly Mimicry

  3U

  Creature — Spirit // Enchantment — AuraU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Goryo's Vengeance

  1B

  Instant — ArcaneB

  Both cards blink (exile-and-return) creatures — their effects stack.
• Shallow Grave

  1B

  InstantB

  Both cards blink (exile-and-return) creatures — their effects stack.
• Whip of Erebos

  2BB

  Legendary Enchantment ArtifactB

  Both cards blink (exile-and-return) creatures — their effects stack.
• Dawn of the Dead

  2BBB

  EnchantmentB

  Both cards blink (exile-and-return) creatures — their effects stack.
• Legion's Initiative

  RW

  EnchantmentRW

  Both cards blink (exile-and-return) creatures — their effects stack.
• Bumi, Unleashed

  3RG

  Legendary Creature — Human Noble AllyGR

  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.
• Wake to Slaughter

  3BR

  SorceryBR

  Both cards blink (exile-and-return) creatures — their effects stack.
• Callidus Assassin

  4UB

  Creature — Human Shapeshifter AssassinBU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Deceptive Frostkite

  UU

  Creature — DragonU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Sakashima's Protege

  4UU

  Creature — ShapeshifterU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Superior Spider-Man

  2UB

  Legendary Creature — Spider Human HeroBU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Glasspool Mimic // Glasspool Shore

  2U

  Creature — Shapeshifter Rogue // LandU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Planar Guide

  W

  Creature — Human ClericW

  Both cards blink (exile-and-return) creatures — their effects stack.
• Invasion of Amonkhet // Lazotep Convert

  1UB

  Battle — Siege // Creature — ZombieBU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• 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.
• Gilraen, Dúnedain Protector

  2W

  Legendary Creature — Human NobleW

  Both cards blink (exile-and-return) creatures — their effects stack.
• Postmortem Lunge

  XB/P

  SorceryB

  Both cards blink (exile-and-return) creatures — their effects stack.
• Mockingbird

  XU

  Creature — Bird BardU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Progenitor Mimic

  4GU

  Creature — ShapeshifterGU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Identity Thief

  2UU

  Creature — ShapeshifterU

  Both cards blink (exile-and-return) creatures — their effects stack.
• Activated Sleeper

  2B

  Creature — Phyrexian ShapeshifterB

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Malleable Impostor

  3U

  Creature — Faerie ShapeshifterU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Flesh Duplicate

  UU

  Creature — Shapeshifter RebelU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).