Confidence:StrongSolidPlausibleTentativeSpeculative

• 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.
• Bloodline Recollector // Ancestral Craving

  1BB

  Creature — Vampire Warlock // InstantB

  Keldon Necropolis 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

  Keldon Necropolis can kill creatures (with damage or by shrinking them), enabling Chevill, Bane of Monsters's death-trigger or removal payoff.
• 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.
• Private Research

  U

  Enchantment — AuraU

  Keldon Necropolis 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 Keldon Necropolis sacrifices it — the opponent loses the permanent for good.
• Bequeathal

  G

  Enchantment — AuraG

  Keldon Necropolis 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 Keldon Necropolis 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 Keldon Necropolis sacrifices it — the opponent loses the permanent for good.
• Kraven the Hunter

  1BG

  Legendary Creature — Human Warrior VillainBG

  Keldon Necropolis can kill creatures (with damage or by shrinking them), enabling Kraven the Hunter's death-trigger or removal payoff.
• 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.
• Fiery Gambit

  2R

  SorceryR

  Fiery Gambit untaps all (or many) permanents, refreshing Keldon Necropolis's tap activation.
• Nicol Bolas, Planeswalker

  4UBBR

  Legendary Planeswalker — BolasBRU

  Nicol Bolas, Planeswalker temporarily takes control of an opponent's creature, and Keldon Necropolis sacrifices it — the opponent loses the permanent for good.
• Innocuous Researcher

  3G

  Creature — Centaur DetectiveG

  Innocuous Researcher untaps all (or many) permanents, refreshing Keldon Necropolis's tap activation.
• Enduring Renewal

  2WW

  EnchantmentW

  Keldon Necropolis can kill creatures (with damage or by shrinking them), enabling Enduring Renewal's death-trigger or removal payoff.
• Garland, Royal Kidnapper

  2UB

  Legendary Creature — Human KnightBU

  Garland, Royal Kidnapper temporarily takes control of an opponent's creature, and Keldon Necropolis sacrifices it — the opponent loses the permanent for good.
• Eater of Virtue

  1

  Legendary Artifact — EquipmentC

  Keldon Necropolis can kill creatures (with damage or by shrinking them), enabling Eater of Virtue's death-trigger or removal payoff.
• Skullclamp

  1

  Artifact — EquipmentC

  Keldon Necropolis can kill creatures (with damage or by shrinking them), enabling Skullclamp's death-trigger or removal payoff.
• Magus of the Candelabra

  G

  Creature — Human WizardG

  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.
• Captivating Glance

  2U

  Enchantment — AuraU

  Captivating Glance temporarily takes control of an opponent's creature, and Keldon Necropolis 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.
• Malicious Affliction

  BB

  InstantB

  Keldon Necropolis can kill creatures (with damage or by shrinking them), enabling Malicious Affliction's death-trigger or removal payoff.
• The Beast, Deathless Prince

  2BR

  Legendary Creature — DemonBR

  The Beast, Deathless Prince temporarily takes control of an opponent's creature, and Keldon Necropolis 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 Keldon Necropolis 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.