Ill try to ask this the best way possible. Im not sure if this will work or not. Probably wont,but al least I can try. Ok, If I have a metalworker in play along with a scroll rack. Can I tap the worker to reveal artifacts to get X mana. Then scroll rack and use the abilty of the worker to reveal cards that I have drew from the rack, Or does the worker stop looking for cards when my hand is empty. In which I would have to have another worker in play or untap the worker I just used to use the ability again, or can this all be part of a stack?