Myr Retriever

Flying You can't lose the game and your opponents can't win the game.

Defender (This creature can't attack.)

Metalcraft — This creature gets +2/+2 as long as you control three or more artifacts.

Metalcraft — T: Tap target artifact, creature, or land. Activate only if you control three or more artifacts.

T: Add W.

T: Add U.

When this creature enters, you may search your library for an artifact card with mana value 1 or less, reveal that card, put it into your hand, then shuffle.