Confidence:StrongSolidPlausibleTentativeSpeculative

• Obsessive Pursuit

  1B

  EnchantmentB

  Both cards trigger when a permanent attacks — they fire together.
• Isshin, Two Heavens as One

  RWB

  Legendary Creature — Human SamuraiBRW

  Isshin, Two Heavens as One makes Shriekwood Devourer'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 Shriekwood Devourer's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Arna Kennerüd, Skycaptain

  2WUB

  Legendary Creature — Human KnightBUW

  Both cards trigger when a permanent attacks — they fire together.
• Bonny Pall, Clearcutter

  3GUU

  Legendary Creature — Giant ScoutGU

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

  2WUB

  Legendary Creature — HorrorBUW

  Both cards trigger when a permanent attacks — they fire together.
• Invasion of Tarkir // Defiant Thundermaw

  1R

  Battle — Siege // Creature — DragonR

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

  2RW

  EnchantmentRW

  Both cards trigger when a permanent attacks — they fire together.
• Misty Mountains Raider

  4R

  Creature — Goblin SoldierR

  Both cards trigger when a permanent attacks — they fire together.
• Path of Bravery

  2W

  EnchantmentW

  Both cards trigger when a permanent attacks — they fire together.
• Guide of Souls

  W

  Creature — Human ClericW

  Both cards trigger when a permanent attacks — they fire together.
• Craig Boone, Novac Guard

  1RW

  Legendary Creature — Human SoldierRW

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

  4

  Artifact Creature — GolemC

  Roaming Throne makes Shriekwood Devourer's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• The Tenth Doctor

  3UR

  Legendary Creature — Time Lord DoctorRU

  Both cards trigger when a permanent attacks — they fire together.
• Mishra, Claimed by Gix

  2BR

  Legendary Creature — Phyrexian Human ArtificerBR

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

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Shriekwood Devourer's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Echoing Assault

  4R

  EnchantmentR

  Both cards trigger when a permanent attacks — they fire together.
• Riddle Gate Gargoyle

  WU

  Artifact Creature — GargoyleUW

  Both cards trigger when a permanent attacks — they fire together.
• Cavalcade of Calamity

  1R

  EnchantmentR

  Both cards trigger when a permanent attacks — they fire together.
• Champions from Beyond

  XWW

  EnchantmentW

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

  1UB

  Enchantment — AuraBU

  Both cards trigger when a permanent attacks — they fire together.
• Gimli's Reckless Might

  3R

  EnchantmentR

  Both cards trigger when a permanent attacks — they fire together.
• Shard of Broken Glass

  1

  Artifact — EquipmentC

  Both cards trigger when a permanent attacks — they fire together.
• Reaper's Talisman

  B

  Artifact — EquipmentB

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

  3WW

  Creature — AngelW

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