+1: Create a tapped Powerstone token. (It's an artifact with “{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.”)
−1: Pay any amount of mana. Look at that many cards from the top of your library, then put one of those cards into your hand and rest on the bottom of your library in a random order.
−7: You get an emblem with “Tap an untapped artifact you control: This emblem deals 1 damage to any target.”
Near Mint - $1.300
Lightly Played - $1.100
Moderately Played - $900
Heavily Played - $800
Damaged - $700
Near Mint Spanish - $1.300
Lightly Played Spanish - $1.100
Moderately Played Spanish - $900
Heavily Played Spanish - $800
Damaged Spanish - $700
Foil Prices
Near Mint Foil - $1.600
Lightly Played Foil - $1.300
Moderately Played Foil - $1.100
Heavily Played Foil - $1.000
Damaged Foil - $800
Near Mint Foil Spanish - $1.600
Lightly Played Foil Spanish - $1.300
Moderately Played Foil Spanish - $1.100
Heavily Played Foil Spanish - $1.000
Damaged Foil Spanish - $800