Artifact spells you cast have convoke. (Your creatures can help cast those spells. Each creature you tap while casting an artifact spell pays for {1} or one mana of that creature's color.)
An eye for detail, a mind for numbers, a soul of clockwork.
Near Mint - $0.95
Lightly Played - $0.90
Moderately Played - $0.71
Heavily Played - $0.57
Damaged - $0.38
Near Mint Non-English - $0.95
Lightly Played Non-English - $0.90
Moderately Played Non-English - $0.71
Heavily Played Non-English - $0.57
Damaged Non-English - $0.38