Omul Ur-Golem 1stborn of Karn

Partner with Xratis, Golem crafter of Karn(When this creature enters the battlefield, target player may put Xratis, Golem crafter of Karn
into their hand from their library, then shuffle.)
{w}{u}{b}{r}{g}{t} sacrifice a Golem token,
Search your library for a golem card and put
it into your hand. Then shuffle your library.