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.
![Karn, Legacy Reforged [March of the Machine: The Aftermath]](http://paradoxtcg.com/cdn/shop/products/604bd887-fb04-5130-aac2-086aacd3d640.png?v=1702309931&width=1445)
