Nunu Rework Idea

So I had an idea for a Nunu rework. Nunu is efficient but very boring to play. Nunu only has 2 damaging abilities and W is very unsatisfying. So here's my idea:

Q: Remains the same, but now you gain one stack up to 5 times

W: Consume your stacks for bonus attack speed and movement speed. More stacks, more speed. I feel like this adds just a little bit of setup to this ability and makes it just a little more fun and interesting.

E: Throws a snowball in the air that hits hits the ground damaging and slowing all enemies caught in the circle. If enemies stay in the circle for too long they are frozen in place. I'm thinking a Kog Maw ult size circle, not too big, but big enough to hit multiple enemies in a team fight. It would also help set up his ult.

R: For the ult it would be essentially the same except for one difference. Nunu now hops off of Willump and can throw snowballs while Willump charges up. Nunu's ult is almost always disrupted before he can do any damage now that most champs have some form of CC. Willump will now have a separate health bar (obviously smaller than normal), meaning the enemy team will have to stop the ult with CC or burst him down. Nunu will be allowed to move freely until Willump stops his ult, after that Willump will run back to Nunu and he'll climb back on top.

I think this kit allows for Nunu to be more reliant in team fights and it also lets him set up some interesting plays instead of just being a counter jungling monster.