Metalworker

{3} · Artifact Creature — Construct

{T}: Reveal any number of artifact cards in your hand. Add {C}{C} for each card revealed this way.

Motor: se resuelve a mano

Rulings (2)

This is a mana ability. It does not go on the stack and can’t be responded to.
Wizards of the Coast · 2004-10-04
You can reveal zero cards to gain zero mana.
Wizards of the Coast · 2004-10-04