Since so many people are going to have decks full of mana Myr, Myr tokens, and other small artifact creatures meant to hit metalcraft, hes going to be harder to chump block, or if he does get blocked, its going to be by a higher quality creature
All other objects such as cards in the graveyard only have an owner
Court Homunculus, essentially the artifact version of Isamaru, Hound of Konda, is a nice little piece for any aggressive artifact deck that may show up
Elves make mana and can attack
Blighted Agent Blighted Agent is already an unblockable infect creature to guide you to a slow-but-steady win condition
As another instant, you know youre getting something good here