Darksteel Juggernaut

Indestructible, trample
{u/b}{u/b}: Return target artifact from your graveyard to your hand.
{u/b}{u/b}{u/b}: Sacrifice an artifact, surveil 2, then draw two cards.
{u/b}{u/b}{u/b}{u/b}: Search your library for an artifact card, reveal it and put it into your hand.