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 - $0.80
Near Mint Non-English - $0.80
Lightly Played - $0.80
Lightly Played Non-English - $0.80
Played - $0.60
Played Non-English - $0.60
Heavily Played - $0.50
Heavily Played Non-English - $0.50
Damaged - $0.40
Damaged Non-English - $0.40