I feel the 2% movement speed given to your team is unnecessary. While certain champions do have that sort of benefit, they are mainly support champions, Twisted Fate being the exception.
You only have one mana cost for each ability, and yet have 5 cooldowns for each rank. Mana has ranks too, that go up instead of down. While it is true that mana cost does not change for some abilities, it is usually only one.
Darius' Decimate (Q) range is 425. Tibbers' AOE Damage range is 560. Nunu's Ultimate range is 1300.
And of course, correct punctuation and grammar goes a long way.
Thank you for the bump, and this is a good start.
EDIT: I just wanted to post! Why did it happen 5 times?!