Kozilek, the Mindbreaker

This spell can't be countered.
When you cast this spell, draw 4 cards.
When an opponent casts a spell, you may
exchange control of that spell and target nonlegendary creature you control. You may
choose new targets for the spell. This may only
be done once per turn.
Menace, translate X, indestructible.
The symbol of insanity.