Tristan, the Big Big Brother

Partner with Rebecca, Miracle Child - when Tristan, the Big Big Brother enters the battlefield search your library for Rebecca, Miracle Child and put it into your hand then shuffle your library.
{x}{u}{u}: tap X target creatures they do not untap during their controller's next untap step.
{x}{g}{g}: Target creature you control gains +X/+X and trample until end of turn.