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 - $13.50
Lightly Played - $12.20
Moderately Played - $10.80
Heavily Played - $9.50
Damaged - $6.80
NM-Mint Non English - $13.50
Lightly Played Non English - $12.20
Moderately Played Non English - $10.80
Heavily Played Non English - $9.50
Damaged Non English - $6.80