At the beginning of your upkeep, exile the top card of your library. You may play that card this turn.
At the beginning of your end step, if you didn't play a card from exile this turn, create a tapped Powerstone token. (It's an artifact with “{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.”)
Near Mint - $0.95
Lightly Played - $0.90
Moderately Played - $0.76
Heavily Played - $0.57
Damaged - $0.47
Near Mint Non-English - $0.95
Lightly Played Non-English - $0.90
Moderately Played Non-English - $0.76
Heavily Played Non-English - $0.57
Damaged Non-English - $0.47
Foil Prices
Near Mint Foil - $0.95
Lightly Played Foil - $0.90
Moderately Played Foil - $0.76
Heavily Played Foil - $0.57
Damaged Foil - $0.47
Near Mint Foil Non-English - $0.95
Lightly Played Foil Non-English - $0.90
Moderately Played Foil Non-English - $0.76
Heavily Played Foil Non-English - $0.57
Damaged Foil Non-English - $0.47