Spells you cast have affinity for artifact creatures that weren't originally artifact creatures. (They cost 1 less to cast for each artifact creature you control that wasn't originally an artifact creature.)
1UU: Target permanent becomes an artifact in addition to its other types.
NM-Mint - $15.20
Lightly Played - $14.50
Moderately Played - $13.70
Heavily Played - $12.20
Damaged - $9.90
NM-Mint Non English - $15.20
Lightly Played Non English - $14.50
Moderately Played Non English - $13.70
Heavily Played Non English - $12.20
Damaged Non English - $9.90