Chief Engineer - 47 R PM15 Foil

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.
rare
Creature — Vedalken Artificer
From the Magic: The Gathering set Magic 2015 Promos.