Confidence:StrongSolidPlausibleTentativeSpeculative

• Arna Kennerüd, Skycaptain

  2WUB

  Legendary Creature — Human KnightBUW

  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.
• Champions from Beyond

  XWW

  EnchantmentW

  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.
• Innkeeper's Talent

  1G

  Enchantment — ClassG

  Counter synergy: both cards work with the same kind of counters, so their effects stack in a counters deck. Not necessarily a closed loop on its own.
• Shard of Broken Glass

  1

  Artifact — EquipmentC

  Both cards trigger when a permanent attacks — they fire together.
• Nuka-Nuke Launcher

  2

  Artifact — EquipmentC

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

  4R

  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.
• Bone Sabres

  2G

  Artifact — EquipmentG

  Both cards trigger when a permanent attacks — they fire together.
• Doors of Durin

  3RG

  Legendary ArtifactGR

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

  2R

  Enchantment — AuraR

  Both cards trigger when a permanent attacks — they fire together.
• Cloak of Confusion

  1B

  Enchantment — AuraB

  Both cards trigger when a permanent attacks — they fire together.
• Andúril, Narsil Reforged

  2

  Legendary Artifact — EquipmentC

  Both cards trigger when a permanent attacks — they fire together.
• Curse of Chaos

  2R

  Enchantment — Aura CurseR

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

  1U

  Creature — ShapeshifterU

  Both cards trigger when a permanent attacks — they fire together.
• Narset, Enlightened Exile

  1URW

  Legendary Creature — Human MonkRUW

  Both cards trigger when a permanent attacks — they fire together.
• Zur the Enchanter

  1WUB

  Legendary Creature — Human WizardBUW

  Both cards trigger when a permanent attacks — they fire together.
• Agrus Kos, Spirit of Justice

  2RW

  Legendary Creature — Spirit DetectiveRW

  Both cards trigger when a permanent attacks — they fire together.
• Bilbo, Thief in the Night

  1U

  Legendary Creature — Halfling RogueU

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

  4BB

  Kindred Enchantment — DemonB

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

  3UU

  Creature — TurtleU

  Both cards trigger when a permanent attacks — they fire together.
• Phlage, Titan of Fire's Fury

  1RW

  Legendary Creature — Elder GiantRW

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

  1B

  EnchantmentB

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