Confidence:StrongSolidPlausibleTentativeSpeculative

• Mikaeus, the Unhallowed✓

  3BBB

  Legendary Creature — Zombie ClericB

  Death replacement: a death-replacement grant on one card lets the other repeatedly die-and-return for combo (Mikaeus + Walking Ballista class).
• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight✓

  3WW

  Legendary Creature — Elemental God // Legendary Creature — Elemental GodBW

  Death replacement: a death-replacement grant on one card lets the other repeatedly die-and-return for combo (Mikaeus + Walking Ballista class).
• 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.
• 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.
• Urza, Lord High Artificer

  2UU

  Legendary Creature — Human ArtificerU

  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

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

  2UU

  Creature — Human Rogue ArtificerU

  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.
• Esper Sojourners

  WUB

  Artifact Creature — Vedalken WizardBUW

  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.
• Icebreaker Kraken

  10UU

  Snow Creature — KrakenU

  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.
• 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.
• Secluded Starforge

  LandC

  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.
• Bloodline Recollector // Ancestral Craving

  1BB

  Creature — Vampire Warlock // InstantB

  Blasting Station can kill creatures (with damage or by shrinking them), enabling Bloodline Recollector's death-trigger or removal payoff.
• Chevill, Bane of Monsters

  BG

  Legendary Creature — Human RogueBG

  Blasting Station can kill creatures (with damage or by shrinking them), enabling Chevill, Bane of Monsters's death-trigger or removal payoff.
• Season of Growth

  1G

  EnchantmentG

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

  B

  Creature — Klingon AdvisorB

  Recursion engine: one card can reanimate repeatedly (an activated ability, or a return that comes back once a turn), and the other is a creature worth bringing back again and again — or a creature you recast from your graveyard beside a sacrifice outlet that doesn't pay for the recast. Real, repeatable value — not an infinite loop on its own.
• Spreading Plague

  4B

  EnchantmentB

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

  U

  Enchantment — AuraU

  Blasting Station can kill creatures (with damage or by shrinking them), enabling Private Research's death-trigger or removal payoff.
• Merieke Ri Berit

  WUB

  Legendary Creature — HumanBUW

  Merieke Ri Berit temporarily takes control of an opponent's creature, and Blasting Station sacrifices it — the opponent loses the permanent for good.
• Tinybones Joins Up

  B

  Legendary EnchantmentB

  Both cards trigger when a creature enters the battlefield — they fire together.
• Faramir, Steward of Gondor

  1WU

  Legendary Creature — Human NobleUW

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

  G

  Enchantment — AuraG

  Blasting Station can kill creatures (with damage or by shrinking them), enabling Bequeathal's death-trigger or removal payoff.
• Varchild, Betrayer of Kjeldor

  2R

  Legendary Creature — Human KnightR

  Varchild, Betrayer of Kjeldor temporarily takes control of an opponent's creature, and Blasting Station sacrifices it — the opponent loses the permanent for good.
• Eye of Singularity

  3W

  World EnchantmentW

  Both cards trigger when a creature enters the battlefield — they fire together.
• Edea, Possessed Sorceress

  2UBR

  Legendary Creature — Human WarlockBRU

  Edea, Possessed Sorceress temporarily takes control of an opponent's creature, and Blasting Station sacrifices it — the opponent loses the permanent for good.

• WithMikaeus, the Unhallowed3BBBB

  Death replacement: a death-replacement grant on one card lets the other repeatedly die-and-return for combo (Mikaeus + Walking Ballista class). These two can't keep the loop going alone — add one of these to complete it:

  MoonshadowBSpitting Dilophosaurus2BPersistent Constrictor4BBlighted Blackthorn4BCreakwood Safewright1BPutrid Goblin1B
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• WithEirdu, Carrier of Dawn // Isilu, Carrier of Twilight3WWBW

  Death replacement: a death-replacement grant on one card lets the other repeatedly die-and-return for combo (Mikaeus + Walking Ballista class). These two can't keep the loop going alone — add one of these to complete it:

  Scrapyard Recombiner3Clockwork Beetle1Threefold Thunderhulk7Tetravus6Arcbound Worker1Iron Apprentice1
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