Cave of the Vultures

When Cave of the Vultures enters the battlefield,
you may reveal a Vulture card from your hand.
If you don't, Cave of the Vultures comes
into play tapped.
{t}: Add {r} or {w} to your mana pool.
{r/w}{r/w}{r/w}: Until end of turn, Cave of the Vultures becomes a 2/2 red and white Vulture creature
with flying and haste.