Greg, Master of Obesity

When Greg, Master of Obesity enters the battlefield, reveal your hand, each opponent
chooses a nonland card from omong them, that
player must casts that card without paying it's
mana cost.
Whenever an opponent cast a spell they don't
own, that player exiles the top card of their
library, you must cast that spell without paying
its mana cost.
*heavy wheezing*-Greg