Confuse!

Once per turn, you may pay {3}. If you do, roll a D20
1: Discard 3 cards.
2-4: Draw 2 cards.
5-8: Deal 2 damage to target creature or player.
9-11: Scry 4.
12-14: Target player mills 3 cards.
15-17: Gain 4 life.
18-19: Destroy target creature. It can't be regenerated.
20. Choose any 2.