Like LansXero said, Modern as played in competitive is a very high-powered format; you have the potential to lose on turn 4 if you're not packing the right stuff. This just wouldn't cut it; you have a bunch of tiny 1/1s and no way to buff them until turn 3 at the earliest. However, there is a deck that does something similar with cheap creatures and buffing them up, called Bogles. Instead of flying, it has hexproof, and it uses Auras instead of +1/+1 counters. If you're not opposed to netdecking, this could be a similar playstyle that's much more viable. Of course, if you're just playing with some friends, a more casual deck is perfectly fine.