Let the Galaxy Burn

Date Fuoco alla Galassia (Let the Galaxy Burn) (it)

Sorcery (CMC 6)
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)
Let the Galaxy Burn deals X plus 2 damage to each creature that didn't enter the battlefield this turn.