Imperius Castor

{r}, {t}, Discard a card: Destroy target blue permanent.
{1}{r}{t}, {t}, Discard a card: Imperius Castor
deals 3 damage to any target. A creature dealt damage this way can't be regenerated this turn.
{5}{r}{r}, {t}, Discard a card: Imperius Castor
deals 6 damage to each creature and each player.

“Nothing a well-placed fireball cannot fix.”
- Imperius Castor