Confidence:StrongSolidPlausibleTentativeSpeculative

• Keiga, the Tide Star

  5U

  Legendary Creature — Dragon SpiritU

  Synergy between the two cards.
• Baron Helmut Zemo

  BBB

  Legendary Creature — Human Noble VillainB

  Copy engine: one card makes a copy of a creature every turn, and the other's enter-the-battlefield effect rewards each copy. Real, repeatable value — the partner can't untap or re-enter the copier, so it never goes infinite.
• Chevill, Bane of Monsters

  BG

  Legendary Creature — Human RogueBG

  Heart-Piercer Manticore produces damage that can kill creatures, enabling Chevill, Bane of Monsters's death-trigger or removal payoff.
• Minsc & Boo, Timeless Heroes

  2RG

  Legendary Planeswalker — MinscGR

  Heart-Piercer Manticore produces damage that can kill creatures, enabling Minsc & Boo, Timeless Heroes's death-trigger or removal payoff.
• Banon, the Returners' Leader

  RW

  Legendary Creature — Human Cleric RebelRW

  Graveyard pair: one card brings creatures back from the graveyard repeatedly (or a creature that returns itself), and the other keeps feeding the loop — a recurring reanimator with a payoff, or a sacrifice outlet with a self-recurring creature.
• Captivating Glance

  2U

  Enchantment — AuraU

  Captivating Glance temporarily takes control of an opponent's creature, and Heart-Piercer Manticore sacrifices it — the opponent loses the permanent for good.
• The Meathook Massacre

  XBB

  Legendary EnchantmentB

  Heart-Piercer Manticore produces damage that can kill creatures, enabling The Meathook Massacre'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 Heart-Piercer Manticore 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 Heart-Piercer Manticore sacrifices it — the opponent loses the permanent for good.
• Gravecrawler

  B

  Creature — ZombieB

  Graveyard pair: one card brings creatures back from the graveyard repeatedly (or a creature that returns itself), and the other keeps feeding the loop — a recurring reanimator with a payoff, or a sacrifice outlet with a self-recurring creature.
• Bequeathal

  G

  Enchantment — AuraG

  Heart-Piercer Manticore produces damage that can kill creatures, enabling Bequeathal's death-trigger or removal payoff.
• Kraven the Hunter

  1BG

  Legendary Creature — Human Warrior VillainBG

  Heart-Piercer Manticore produces damage that can kill creatures, enabling Kraven the Hunter's death-trigger or removal payoff.
• Gisa, the Hellraiser

  3BB

  Legendary Creature — Human WarlockB

  Both cards produce the same kind of effect (shared token subtype).
• Varchild, Betrayer of Kjeldor

  2R

  Legendary Creature — Human KnightR

  Varchild, Betrayer of Kjeldor temporarily takes control of an opponent's creature, and Heart-Piercer Manticore sacrifices it — the opponent loses the permanent for good.
• Undead Sprinter

  BR

  Creature — ZombieBR

  Graveyard pair: one card brings creatures back from the graveyard repeatedly (or a creature that returns itself), and the other keeps feeding the loop — a recurring reanimator with a payoff, or a sacrifice outlet with a self-recurring creature.
• Toshiro Umezawa

  1BB

  Legendary Creature — Human SamuraiB

  Heart-Piercer Manticore produces damage that can kill creatures, enabling Toshiro Umezawa's death-trigger or removal payoff.
• Malicious Affliction

  BB

  InstantB

  Heart-Piercer Manticore produces damage that can kill creatures, enabling Malicious Affliction's death-trigger or removal payoff.
• Timeline Culler

  BB

  Creature — Drix WarlockB

  Graveyard pair: one card brings creatures back from the graveyard repeatedly (or a creature that returns itself), and the other keeps feeding the loop — a recurring reanimator with a payoff, or a sacrifice outlet with a self-recurring creature.
• Enduring Renewal

  2WW

  EnchantmentW

  Heart-Piercer Manticore produces damage that can kill creatures, 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 Heart-Piercer Manticore sacrifices it — the opponent loses the permanent for good.
• Glissa, the Traitor

  BGG

  Legendary Creature — Phyrexian Zombie ElfBG

  Heart-Piercer Manticore produces damage that can kill creatures, enabling Glissa, the Traitor's death-trigger or removal payoff.
• Nicol Bolas, Planeswalker

  4UBBR

  Legendary Planeswalker — BolasBRU

  Nicol Bolas, Planeswalker temporarily takes control of an opponent's creature, and Heart-Piercer Manticore sacrifices it — the opponent loses the permanent for good.
• Emeritus of Woe // Demonic Tutor

  3B1B

  Creature — Vampire Warlock // SorceryB

  Heart-Piercer Manticore produces damage that can kill creatures, enabling Emeritus of Woe'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 Heart-Piercer Manticore sacrifices it — the opponent loses the permanent for good.
• Skullclamp

  1

  Artifact — EquipmentC

  Heart-Piercer Manticore produces damage that can kill creatures, enabling Skullclamp's death-trigger or removal payoff.