Sensei's Workshop

During your upkeep, put one Divine Counter on Sensei's Workshop.
{1},{t}: Draw a card, then discard a card.
{x},{t}: Put X Divine Counters on Sensei's Workshop.
{x},{t}:Remove X "Divine Counters" from Sensei's Workshop. Then, you may cast an Artifact spell from your hand with a converted mana cost less then X without paying its mana cost. X can't be 0.