Raven, Goth GF

You can't spend mana to cast Raven, Goth GF.
Only cast Raven if there are 10 or more cards in a graveyard.
Raven enters the battlefield with X +1/+1
counters on her, where X is the number of
groans that were cast from your opponents'
mouths this turn.
"Gotta have them alternate win conditions."
-Trevor