Fun with Amumu

So I finally bought Amumu. I played a round me and lillystar against 5 other bot with our 3 beginner bots.
Didnt go as planned for the most part.
Our Malphite went OP as hell and was dominating Lillystarrs kills and such. I on the other hand had a blast first time amumu figuring out his moves, trying some combo moves and just having fun. I built him to be tanky but to also be a ks'er or to just do a lot of damage. At full built I was running the show near the end. 5v1 and I still was alive with plenty of mana, not to mention I had a 3 second cooldown on my E which was awesome because it was my main move to farm and do a lot of damage over and over to the bots and buffs. A few more private games just me vs. bots and I should have him narrowed down to go ass whooping mode in aram.