Metalworker
Artifact Creature — Construct
: Reveal any number of artifact cards in your hand. Add 
for each card revealed this way.
"At this rate I fully expect to be replaced by a clockwork golem by year's end." —Barrin
Don Hazeltine
Urza's Destiny (UDS)
• #135Rulings
This is a mana ability. It does not go on the stack and can’t be responded to.
(wotc • 2004-10-04)
You can reveal zero cards to gain zero mana.
(wotc • 2004-10-04)
Rulings
This is a mana ability. It does not go on the stack and can’t be responded to.
(wotc • 2004-10-04)
You can reveal zero cards to gain zero mana.
(wotc • 2004-10-04)