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.
NM-Mint Foil - $9.60
Lightly Played Foil - $9.10
Moderately Played Foil - $8.70
Heavily Played Foil - $7.70
Damaged Foil - $6.30
NM-Mint Foil Non English - $9.60
Lightly Played Foil Non English - $9.10
Moderately Played Foil Non English - $8.70
Heavily Played Foil Non English - $7.70
Damaged Foil Non English - $6.30