Xavier, Academy Director

Vigilance, Reach
{r},{t}: Give target creature haste.
{u}{u}{1},{t}: Tap target creature, proliferate.
{g}{3},{t}: Target Mutant creature gets +X/+X, where X is Xavier, Academy Director's toughness.
{w}{4},{t}: Search your library for a Mutant creature. Reveal it, then put it into your hand. Shuffle your library.
{b}{x},{t}: Target player Exiles the top X cards of their library. Until end of turn, you may play those cards.