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.
NM-Mint Foil - $3.80
Lightly Played Foil - $3.50
Moderately Played Foil - $3.10
Heavily Played Foil - $2.70
Damaged Foil - $1.90
NM-Mint Foil Non English - $3.80
Lightly Played Foil Non English - $3.50
Moderately Played Foil Non English - $3.10
Heavily Played Foil Non English - $2.70
Damaged Foil Non English - $1.90