Polymorphist's Jest says each creature target player controls loses all abilities and becomes a blue Frog with a base power and toughness 1/1. My question is... how would this work with Emrakul? Like let's say a player attacks with Emrakul, you cast Polymoprhist's Jest and then lightning bolt Emrakul.
My assumption is that the defending player would still have to sacrifice six permanents because the attack is earlier in the stack.
And when Emrakul hits the graveyard does it go into the graveyard and stay there or does the graveyard still get shuffled into the library?