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 - $0.20
Lightly Played - $0.20
Moderately Played - $0.20
Heavily Played - $0.10
Damaged - $0.10
NM-Mint Non English - $0.20
Lightly Played Non English - $0.20
Moderately Played Non English - $0.20
Heavily Played Non English - $0.10
Damaged Non English - $0.10