A friend of mine once had a similar deck, though it only had 40 cards in it to increase chances for getting the right things, yours is basically the same just with more creatures and more buffs.
The deck worked fine, if he attacked with 2 creatures and only 1 was blocked, he'd just buff the other.
But you might have trouble with cheap instants that deal little damage, or something that deals 1 to everythings.