Confidence:StrongSolidPlausibleTentativeSpeculative

• Hermes, Overseer of Elpis

  3U

  Legendary Creature — Elder WizardU

  Both cards trigger when a permanent attacks — they fire together.
• Arna Kennerüd, Skycaptain

  2WUB

  Legendary Creature — Human KnightBUW

  Both cards trigger when a permanent attacks — they fire together.
• Soaring Thought-Thief

  UB

  Creature — Human RogueBU

  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.
• Grolnok, the Omnivore

  2GU

  Legendary Creature — FrogGU

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

  XGG

  EnchantmentG

  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.
• Dromoka, the Eternal

  3GW

  Legendary Creature — DragonGW

  Both cards trigger when a permanent attacks — they fire together.
• Silumgar, the Drifting Death

  4UB

  Legendary Creature — DragonBU

  Both cards trigger when a permanent attacks — they fire together.
• Norn's Choirmaster

  3WW

  Creature — Phyrexian AngelW

  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.