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.
Format Legality
Standard Not_legal
Pioneer Legal
Modern Legal
Legacy Legal
Vintage Legal
Commander Legal
Pauper Not_legal
