Confidence:StrongSolidPlausibleTentativeSpeculative

• Julian Bashir, Frontier Doctor

  2W

  Legendary Creature — Human DoctorW

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• 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.
• Tolarian Kraken

  4UU

  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.
• Thornbite Staff

  2

  Kindred Artifact — Shaman EquipmentC

  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.
• 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.
• Merieke Ri Berit

  WUB

  Legendary Creature — HumanBUW

  Merieke Ri Berit temporarily takes control of an opponent's creature, and Shadowheart, Dark Justiciar sacrifices it — the opponent loses the permanent for good.
• Varchild, Betrayer of Kjeldor

  2R

  Legendary Creature — Human KnightR

  Varchild, Betrayer of Kjeldor temporarily takes control of an opponent's creature, and Shadowheart, Dark Justiciar sacrifices it — the opponent loses the permanent for good.
• Edea, Possessed Sorceress

  2UBR

  Legendary Creature — Human WarlockBRU

  Edea, Possessed Sorceress temporarily takes control of an opponent's creature, and Shadowheart, Dark Justiciar sacrifices it — the opponent loses the permanent for good.
• Undead Sprinter

  BR

  Creature — ZombieBR

  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.
• Copperhorn Scout

  G

  Creature — Elf ScoutG

  Copperhorn Scout untaps all (or many) permanents, refreshing Shadowheart, Dark Justiciar's tap activation.
• Nicol Bolas, Planeswalker

  4UBBR

  Legendary Planeswalker — BolasBRU

  Nicol Bolas, Planeswalker temporarily takes control of an opponent's creature, and Shadowheart, Dark Justiciar sacrifices it — the opponent loses the permanent for good.
• Garland, Royal Kidnapper

  2UB

  Legendary Creature — Human KnightBU

  Garland, Royal Kidnapper temporarily takes control of an opponent's creature, and Shadowheart, Dark Justiciar sacrifices it — the opponent loses the permanent for good.
• White Plume Adventurer

  2W

  Creature — Orc ClericW

  White Plume Adventurer untaps all (or many) permanents, refreshing Shadowheart, Dark Justiciar's tap activation.
• Captivating Glance

  2U

  Enchantment — AuraU

  Captivating Glance temporarily takes control of an opponent's creature, and Shadowheart, Dark Justiciar sacrifices it — the opponent loses the permanent for good.
• Detective's Phoenix

  2R

  Enchantment Creature — PhoenixR

  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.
• The Beast, Deathless Prince

  2BR

  Legendary Creature — DemonBR

  The Beast, Deathless Prince temporarily takes control of an opponent's creature, and Shadowheart, Dark Justiciar sacrifices it — the opponent loses the permanent for good.
• The Nipton Lottery

  2BR

  SorceryBR

  The Nipton Lottery temporarily takes control of an opponent's creature, and Shadowheart, Dark Justiciar sacrifices it — the opponent loses the permanent for good.
• Timeline Culler

  BB

  Creature — Drix WarlockB

  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.
• Red Ghost, Intangible Genius

  2UR

  Legendary Creature — Human Scientist VillainRU

  Draw pair: both cards engage with card draw. With a damage-or-draw trigger between them they form a draw engine.
• The Wrath of Khan

  2R

  Enchantment — SagaR

  The Wrath of Khan temporarily takes control of an opponent's creature, and Shadowheart, Dark Justiciar sacrifices it — the opponent loses the permanent for good.
• Hogaak, Arisen Necropolis

  5B/GB/G

  Legendary Creature — AvatarBG

  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.
• Hildibrand Manderville // Gentleman's Rise

  1W2B

  Legendary Creature — Human Detective // Instant — AdventureBW

  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.
• Tribute to Horobi // Echo of Death's Wail

  1B

  Enchantment — Saga // Enchantment Creature — SpiritB

  Tribute to Horobi temporarily takes control of an opponent's creature, and Shadowheart, Dark Justiciar sacrifices it — the opponent loses the permanent for good.
• Tenacious Underdog

  1B

  Creature — Human WarriorB

  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.
• Skaab Ruinator

  1UU

  Creature — Zombie HorrorU

  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.