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 (Retro) [March of the Machine: The Aftermath] | Grognard Games](http://grognardgames.com/cdn/shop/files/47b1d426-db36-4a6d-9eb7-d093e0c0ee6a_432085a0-c7e4-44a8-9665-38a2c936dbc2.png?v=1776068916)
