Cthulhu, the Unthinkable

Cthulhu, the Unthinkable costs {2} more to cast
for each card in your hand. (Including Cthulhu.)
Flying, Indestructible, Trample
Cthulhu gets -1/-1 for each card in each player's
hand. Whenever a player casts a spell, that player
discards a card.
When Cthulhu enters the battlefield, if you
didn't cast it, exile it.