Confidence:StrongSolidPlausibleTentativeSpeculative

• Isshin, Two Heavens as One

  RWB

  Legendary Creature — Human SamuraiBRW

  Isshin, Two Heavens as One makes Slumbering Dragon's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Windcrag Siege

  1RW

  EnchantmentRW

  Windcrag Siege makes Slumbering Dragon's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• MacCready, Lamplight Mayor

  WB

  Legendary Creature — Human AdvisorBW

  Both cards trigger when a permanent attacks — they fire together.
• Sarkhan the Masterless

  3RR

  Legendary Planeswalker — SarkhanR

  Both cards trigger when a permanent attacks — they fire together.
• Storm, Queen of Wakanda

  3GW

  Legendary Creature — Mutant Noble HeroGW

  Both cards trigger when a permanent attacks — they fire together.
• Wulfgar of Icewind Dale

  3RG

  Legendary Creature — Human BarbarianGR

  Wulfgar of Icewind Dale makes Slumbering Dragon's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Powerstone Minefield

  2RW

  EnchantmentRW

  Both cards trigger when a permanent attacks — they fire together.
• Raking Canopy

  1GG

  EnchantmentG

  Both cards trigger when a permanent attacks — they fire together.
• Aurelia, the Law Above

  3RW

  Legendary Creature — AngelRW

  Both cards trigger when a permanent attacks — they fire together.
• Palazzo Archers

  2G

  Creature — Human ArcherG

  Both cards trigger when a permanent attacks — they fire together.
• Oath of Kaya

  1WB

  Legendary EnchantmentBW

  Both cards trigger when a permanent attacks — they fire together.
• Roaming Throne

  4

  Artifact Creature — GolemC

  Roaming Throne makes Slumbering Dragon's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Parasitic Impetus

  2B

  Enchantment — AuraB

  Both cards trigger when a permanent attacks — they fire together.
• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Slumbering Dragon's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Riddlekeeper

  2U

  Creature — HomunculusU

  Both cards trigger when a permanent attacks — they fire together.
• Lightmine Field

  2WW

  EnchantmentW

  Both cards trigger when a permanent attacks — they fire together.
• Wizard's Staff

  1U

  Artifact — EquipmentU

  Wizard's Staff makes Slumbering Dragon's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Circle of Flame

  1R

  EnchantmentR

  Both cards trigger when a permanent attacks — they fire together.
• Mirror Mockery

  1U

  Enchantment — AuraU

  Both cards trigger when a permanent attacks — they fire together.
• Psychic Impetus

  2U

  Enchantment — AuraU

  Both cards trigger when a permanent attacks — they fire together.
• Barbed Foliage

  2GG

  EnchantmentG

  Both cards trigger when a permanent attacks — they fire together.
• Luminous Wake

  2W

  Enchantment — AuraW

  Both cards trigger when a permanent attacks — they fire together.
• Orim's Prayer

  1WW

  EnchantmentW

  Both cards trigger when a permanent attacks — they fire together.
• Extra Arms

  4R

  Enchantment — AuraR

  Both cards trigger when a permanent attacks — they fire together.
• Caltrops

  3

  ArtifactC

  Both cards trigger when a permanent attacks — they fire together.