Beholder

{w}{b}: Destroy target creature blocking or blocked by Beholder.
{u}{r}: Beholder gains flying until end of turn.
{b}{g}: Regenerate Beholder
{r}{w}: Beholder gets +1/+1 until end of turn.
{g}{u}: Put Beholder on top of owner's library.

Every year the owlbear gets him a monocle as a birthday gag.