Karn, Legacy Reforged (Retro) [March of the Machine: The Aftermath] Hydra Whenever a creature you control

Whenever a creature you control that's enchanted or equipped attacks

Flashback 3B

Set: Unknown Event Type: Instant — Arcane Rarity: Common (Spells without mana costs can't be played)

"Know the enemies as thy kin

discard your hand

Karn, Legacy Reforged (Retro) [March of the Machine: The Aftermath] Hydra Whenever a creature you controlSet: March of the Machine: The Aftermath Type: Legendary Artifact Creature Golem Rarity: Mythic Cost: {5} Karn, Legacy Reforged's power and toughness are each equal to the greatest mana value among artifacts you control. At the beginning of your upkeep, add C for each artifact you control. This mana can't be spent to cast nonartifact spells. Until end of turn, you don't lose this mana as steps and phases end.