Karn, Legacy Reforged - March of the Machine: The Aftermath #184

Karn, Legacy Reforged

Set: March of the Machine: The Aftermath (MAT)
Collector Number: 184
Type: Legendary Artifact Creature — Golem
Rarity: Mythic
Mana Value: 5.0

Karn'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.