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.)

Whenever Truss, Chief Engineer enters the battlefield or another creature dies, put a hack counter on Truss.

{2}, {T}, Remove X hack counters from Truss: Add or subtract X from a number or number word on target spell or permanent until end of turn. This effect can’t reduce a number below 1 or a number word below one.