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.
• Bloodline Recollector // Ancestral Craving

  1BB

  Creature — Vampire Warlock // InstantB

  Kelsien, the Plague 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

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

  U

  Enchantment — AuraU

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Private Research's death-trigger or removal payoff.
• Quest for the Gravelord

  B

  EnchantmentB

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Quest for the Gravelord's death-trigger or removal payoff.
• Bequeathal

  G

  Enchantment — AuraG

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Bequeathal's death-trigger or removal payoff.
• Kraven the Hunter

  1BG

  Legendary Creature — Human Warrior VillainBG

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Kraven the Hunter'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.
• Lagomos, Hand of Hatred

  1BR

  Legendary Creature — Human ShamanBR

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Lagomos, Hand of Hatred's death-trigger or removal payoff.
• Enduring Renewal

  2WW

  EnchantmentW

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Enduring Renewal's death-trigger or removal payoff.
• Eater of Virtue

  1

  Legendary Artifact — EquipmentC

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

  1

  Artifact — EquipmentC

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Skullclamp'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.
• Malicious Affliction

  BB

  InstantB

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Malicious Affliction's death-trigger or removal payoff.
• Athreos, God of Passage

  1WB

  Legendary Enchantment Creature — GodBW

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Athreos, God of Passage's death-trigger or removal payoff.
• Emeritus of Woe // Demonic Tutor

  3B1B

  Creature — Vampire Warlock // SorceryB

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Emeritus of Woe's death-trigger or removal payoff.
• Ob Nixilis, Unshackled

  4BB

  Legendary Creature — DemonB

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Ob Nixilis, Unshackled's death-trigger or removal payoff.
• Glissa, the Traitor

  BGG

  Legendary Creature — Phyrexian Zombie ElfBG

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Glissa, the Traitor's death-trigger or removal payoff.
• Incendiary

  R

  Enchantment — AuraR

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Incendiary's death-trigger or removal payoff.
• The Meathook Massacre

  XBB

  Legendary EnchantmentB

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling The Meathook Massacre's death-trigger or removal payoff.
• Sticky Fingers

  R

  Enchantment — AuraR

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Sticky Fingers's death-trigger or removal payoff.
• Assault Intercessor

  1WB

  Creature — Astartes WarriorBW

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Assault Intercessor's death-trigger or removal payoff.
• Nurgle's Rot

  B

  Enchantment — AuraB

  Kelsien, the Plague can kill creatures (with damage or by shrinking them), enabling Nurgle's Rot's death-trigger or removal payoff.
• Veteran Beastrider

  1GW

  Creature — Human KnightGW

  Veteran Beastrider untaps all (or many) permanents, refreshing Kelsien, the Plague's tap activation.