Alatreon*

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