Tobus Tarrack the Terrible 3rd

This spell cant be countered
Indestructible, Hexproof
Whenever you cast a non-creature spell on an opponents turn, exile the top card of you library.
Until end of turn you may cast this spell as though
it had flash and without paying its mana cost.
Haha ha. You want to play magic.
Well too bad, You CANT!!!