Warp Lightning

Cascade. (When you cast this spell, exile
cards from the top of your library until you
exile a nonland card whose mana value is less
than this spell's mana value. You may cast that
card without paying its mana cost if the
resulting spell's mana value is less than
this spell's mana value. Then put all cards exiled
this way that weren't cast on the bottom
of your library in a random order.)
Warp Lightning deals 2 damage to any target.