Dent, Savior of Brighthammer

Menace
{x}{x}{w/u},{t}: Create X tapped powerstone tokens.
When Dent, Savior of Brighthammer deals
combat damage to a player, you may cast a
non-creature artifact card from your hand with
mana value X or less without paying its mana cost, where X is half the total number of artifacts you control, rounded down.