Confidence:StrongSolidPlausibleTentativeSpeculative

• 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

  Guul Draz Assassin 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

  Guul Draz Assassin produces damage that can kill creatures, enabling Minsc & Boo, Timeless Heroes's death-trigger or removal payoff.
• The Meathook Massacre

  XBB

  Legendary EnchantmentB

  Guul Draz Assassin produces damage that can kill creatures, enabling The Meathook Massacre's death-trigger or removal payoff.
• Quest for the Gravelord

  B

  EnchantmentB

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

  G

  Enchantment — AuraG

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

  1BG

  Legendary Creature — Human Warrior VillainBG

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

  1BB

  Legendary Creature — Human SamuraiB

  Guul Draz Assassin 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 Guul Draz Assassin's tap activation.
• Malicious Affliction

  BB

  InstantB

  Guul Draz Assassin produces damage that can kill creatures, enabling Malicious Affliction's death-trigger or removal payoff.
• Enduring Renewal

  2WW

  EnchantmentW

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

  BGG

  Legendary Creature — Phyrexian Zombie ElfBG

  Guul Draz Assassin 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 Guul Draz Assassin's tap activation.
• Liliana, Heretical Healer // Liliana, Defiant Necromancer

  1BB

  Legendary Creature — Human Cleric // Legendary Planeswalker — LilianaB

  Guul Draz Assassin produces damage that can kill creatures, enabling Liliana, Heretical Healer's death-trigger or removal payoff.
• Emeritus of Woe // Demonic Tutor

  3B1B

  Creature — Vampire Warlock // SorceryB

  Guul Draz Assassin produces damage that can kill creatures, enabling Emeritus of Woe's death-trigger or removal payoff.
• Skullclamp

  1

  Artifact — EquipmentC

  Guul Draz Assassin produces damage that can kill creatures, enabling Skullclamp's death-trigger or removal payoff.
• Jorn, God of Winter // Kaldring, the Rimestaff

  2G1UB

  Legendary Snow Creature — God // Legendary Snow ArtifactBGU

  Jorn, God of Winter untaps all (or many) permanents, refreshing Guul Draz Assassin's tap activation.
• Jace, Ingenious Mind-Mage

  4UU

  Legendary Planeswalker — JaceU

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

  1BR

  Legendary Creature — Human ShamanBR

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

  4BB

  Legendary Creature — DemonB

  Guul Draz Assassin 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

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

  1WB

  Creature — Astartes WarriorBW

  Guul Draz Assassin 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 Guul Draz Assassin's tap activation.
• The Thirteenth Doctor

  1GU

  Legendary Creature — Time Lord DoctorGU

  The Thirteenth Doctor untaps all (or many) permanents, refreshing Guul Draz Assassin's tap activation.
• Veteran Beastrider

  1GW

  Creature — Human KnightGW

  Veteran Beastrider untaps all (or many) permanents, refreshing Guul Draz Assassin's tap activation.