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
Lightly Played - $0.70
Moderately Played - $0.60
Heavily Played - $0.50
Damaged - $0.40
Near Mint Spanish - $0.80
Lightly Played Spanish - $0.70
Moderately Played Spanish - $0.60
Heavily Played Spanish - $0.50
Damaged Spanish - $0.40