+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 - $1.600
Lightly Played - $1.300
Moderately Played - $1.100
Heavily Played - $1.000
Damaged - $800
Near Mint Spanish - $1.600
Lightly Played Spanish - $1.300
Moderately Played Spanish - $1.100
Heavily Played Spanish - $1.000
Damaged Spanish - $800
Foil Prices
Near Mint Foil - $1.700
Lightly Played Foil - $1.400
Moderately Played Foil - $1.200
Heavily Played Foil - $1.100
Damaged Foil - $900
Near Mint Foil Spanish - $1.700
Lightly Played Foil Spanish - $1.400
Moderately Played Foil Spanish - $1.200
Heavily Played Foil Spanish - $1.100
Damaged Foil Spanish - $900