Nebula of icefire gold

{w},{t}:You gain 1 life
{u}{u},{t}:Draw 3 cards, then discard a card.
{r}{r}{r},{t}:Deal 4 damage to target creature.
{w}{w}{u}{u}{r}{r}:Deal 1 damage to all opponent creatures. Tap 3 target creatures, and you gain 3
life.
Once, a boon, now a boom