Hell

You have no max hand size.
{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{t}: Summon a 20/20 Hell Wizard onto the battlefield with
"{r}{t}: Gain control of target player and all cards he owns.
{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{r}{t}: All opponents put their library into your hand.