Nunu rework

Of all the champions, it seems pretty obvious that nunu is the most useless champion of all. Sure, he has easy sustain in the jungle. He has a decent slow, but he doesn't offer anything in a team fight other than just absorbing damage. His ult is the only thing about him that is cause for concern, but as long as you're not foolish enough to follow him into a bush at low hp then he poses no threat. His ult charge can be cancelled with a stun or other similar cc, so as long as everyone on the team doesn't forget about him he is useless in the team fight. I would like to see him reworked, i got the nunu bot legendary skin shard but its pointless to buy because he's kind of a pointless champ lol