Metalworker

, : Put X charge counters on this artifact. Activate only as a sorcery.

At the beginning of your first main phase, if this artifact has a charge counter on it, tap it and remove all charge counters from it. Add for each charge counter removed this way.

: Add .

, , Sacrifice this artifact: Exile any number of target players' graveyards. Draw a card.

At the beginning of your upkeep and whenever you cast a green spell, put a charge counter on this artifact.

, Sacrifice this artifact: Add for each charge counter on this artifact.

: Add .

Any time you could mulligan and this card is in your hand, you may exile all the cards from your hand, then draw that many cards. (You can do this in addition to taking mulligans.)

Untap this artifact during each other player's untap step.

: A player of your choice adds .

: Add for each artifact you control named Powerstone Shard.