From Cinders to Ash

This spell as different effects depending on the
mana spent to cast it:
{r}{w}{w} • Prevent the next 3 damage dealt to
you, then deal 3 damage to target player.
{r}{w}{u} • Target creature gains +2/+0 and prowess until end of turn.
{r}{u}{u} • Draw 3 cards, then discard 2 cards.