Assassin Artificer

If you control an Artifact, Assassin Artificer can't be blocked.
{u}: Reveal the top card of your library. If it is an artifact, you may play that card. If it is not an artifact, put it into your graveyard instead.
{2}{u}, {t}: Search your library for an artifact card, reveal that card, and put it into your hand. Then shuffle your library.