Hammer, Faithful Traitor

Hammer enters the battlefield with two +1/+1 counters. Whenever you attack, you may remove a +1/+1 counter from Hammer and search your library for an artifact or enchantment with converted mana cost {1}, put it into your hand, reveal it, and then shuffle.

When you remove the last +1/+1 counter from Hammer, sacrifice another creature you control and transform Hammer.