Confidence:StrongSolidPlausibleTentativeSpeculative

• Najeela, the Blade-Blossom

  2R

  Legendary Creature — Human WarriorBGRUW

  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

  Untap loop: each side can untap what the other taps — a genuine mutual refresh engine.
• Chevill, Bane of Monsters

  BG

  Legendary Creature — Human RogueBG

  Kelsien, the Plague 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

  Kelsien, the Plague produces damage that can kill creatures, enabling Minsc & Boo, Timeless Heroes's death-trigger or removal payoff.
• Bloodline Recollector // Ancestral Craving

  1BB

  Creature — Vampire Warlock // InstantB

  Kelsien, the Plague produces damage that can kill creatures, enabling Bloodline Recollector's death-trigger or removal payoff.
• The Meathook Massacre

  XBB

  Legendary EnchantmentB

  Kelsien, the Plague produces damage that can kill creatures, enabling The Meathook Massacre's death-trigger or removal payoff.
• Mari, the Killing Quill

  1BB

  Legendary Creature — Vampire AssassinB

  Kelsien, the Plague produces damage that can kill creatures, enabling Mari, the Killing Quill's death-trigger or removal payoff.
• Quest for the Gravelord

  B

  EnchantmentB

  Kelsien, the Plague produces damage that can kill creatures, enabling Quest for the Gravelord's death-trigger or removal payoff.
• Bequeathal

  G

  Enchantment — AuraG

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

  1BG

  Legendary Creature — Human Warrior VillainBG

  Kelsien, the Plague produces damage that can kill creatures, enabling Kraven the Hunter's death-trigger or removal payoff.
• Toshiro Umezawa

  1BB

  Legendary Creature — Human SamuraiB

  Kelsien, the Plague produces damage that can kill creatures, enabling Toshiro Umezawa's death-trigger or removal payoff.
• Copperhorn Scout

  G

  Creature — Elf ScoutG

  Copperhorn Scout untaps all (or many) permanents, refreshing Kelsien, the Plague's tap activation.
• Malicious Affliction

  BB

  InstantB

  Kelsien, the Plague produces damage that can kill creatures, enabling Malicious Affliction's death-trigger or removal payoff.
• Enduring Renewal

  2WW

  EnchantmentW

  Kelsien, the Plague produces damage that can kill creatures, enabling Enduring Renewal's death-trigger or removal payoff.
• Glissa, the Traitor

  BGG

  Legendary Creature — Phyrexian Zombie ElfBG

  Kelsien, the Plague produces damage that can kill creatures, enabling Glissa, the Traitor's death-trigger or removal payoff.
• White Plume Adventurer

  2W

  Creature — Orc ClericW

  White Plume Adventurer untaps all (or many) permanents, refreshing Kelsien, the Plague's tap activation.
• Liliana, Heretical Healer // Liliana, Defiant Necromancer

  1BB

  Legendary Creature — Human Cleric // Legendary Planeswalker — LilianaB

  Kelsien, the Plague produces damage that can kill creatures, enabling Liliana, Heretical Healer's death-trigger or removal payoff.
• Skullclamp

  1

  Artifact — EquipmentC

  Kelsien, the Plague produces damage that can kill creatures, enabling Skullclamp's death-trigger or removal payoff.
• Jace, Ingenious Mind-Mage

  4UU

  Legendary Planeswalker — JaceU

  Jace, Ingenious Mind-Mage untaps all (or many) permanents, refreshing Kelsien, the Plague's tap activation.
• Lagomos, Hand of Hatred

  1BR

  Legendary Creature — Human ShamanBR

  Kelsien, the Plague produces damage that can kill creatures, enabling Lagomos, Hand of Hatred's death-trigger or removal payoff.
• Ob Nixilis, Unshackled

  4BB

  Legendary Creature — DemonB

  Kelsien, the Plague produces damage that can kill creatures, enabling Ob Nixilis, Unshackled's death-trigger or removal payoff.
• Tevesh Szat, Doom of Fools

  4B

  Legendary Planeswalker — SzatB

  Kelsien, the Plague produces damage that can kill creatures, enabling Tevesh Szat, Doom of Fools's death-trigger or removal payoff.
• Assault Intercessor

  1WB

  Creature — Astartes WarriorBW

  Kelsien, the Plague produces damage that can kill creatures, enabling Assault Intercessor's death-trigger or removal payoff.
• Aggravated Assault

  2R

  EnchantmentR

  Aggravated Assault untaps all (or many) permanents, refreshing Kelsien, the Plague's tap activation.
• Sifa Grent

  3BR

  Legendary Planeswalker — SifaBR

  Kelsien, the Plague produces damage that can kill creatures, enabling Sifa Grent's death-trigger or removal payoff.