Varanael Discombobulus

{x} - Varanael shapes into a creature of your
choice with X/X power/toughness.
Instead of destroying this creature, it shapes back
into Varanael.
This ability can only be used once on your turn.
{4}{r/g}{r/g} - {t} Turn target creature into a
creature of your choice with X/X base power/toughness, where X is the value of
mana you control on the battlefield.