Gol, Rancid Elemental

Haste, Protection from Red and White
When "Gol, Rancid Elemental" attacks,
Target player exiles cards from the top of their
library until they exile a nonland card with mana
value less than the number of elementals you
control, they cast that card without paying it's
mana cost and the rest of the exiled cards get put
on the bottom of their library.
If an opponent would cast a spell this way, gain control of that spell.