At the beginning of your end step, create a tapped Powerstone token. (It's an artifact with “{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.”)
{6}: Draw a card and put a +1/+1 counter on Geology Enthusiast.
NM-Mint - $1.00
Lightly Played - $0.90
Moderately Played - $0.80
Heavily Played - $0.70
Damaged - $0.50
NM-Mint Non English - $1.00
Lightly Played Non English - $0.90
Moderately Played Non English - $0.80
Heavily Played Non English - $0.70
Damaged Non English - $0.50
Foil Prices
NM-Mint Foil - $2.00
Lightly Played Foil - $1.80
Moderately Played Foil - $1.60
Heavily Played Foil - $1.40
Damaged Foil - $1.00
NM-Mint Foil Non English - $2.00
Lightly Played Foil Non English - $1.80
Moderately Played Foil Non English - $1.60
Heavily Played Foil Non English - $1.40
Damaged Foil Non English - $1.00