@Riot: Please say you'll eventually include Medivh's Poly Bomb as an ultimate
Poly Bomb can be extremely devastating if used correctly. You target one enemy, Polymorph them, then after a short delay they will spread the effect to any nearby heroes. This can continue ad infinitum until your enemies spread out enough.
Now, you might say that Varus already does this, but his differs in that it's not a Polymorph, it's a skillshot, it ties into his Blighted Quiver mechanic, and it can't potentially spread an infinite number of times. Medivh's probably sounds illegal for League because it's direct-target, but Medivh doesn't do a lot of damage on his own, so he'd need his teammates to capitalize on the CC he puts out. And no, Lulu's Polymorph doesn't count; it doesn't spread.
Either way, I would love to see Poly Bomb in some shape or form in the game.