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 (Extended Art) [March of the Machine: The Aftermath]](http://tothetablebgc.myshopify.com/cdn/shop/files/b04e6527-06f8-4783-93fc-8738673116c1.png?v=1776362254&width=1445)
