This seems really good in limited. You make an Ooze from all your evolved guys and they all get a +1/+1 counter back.
Say you have 3 Evolve guys out. You use this and remove all their counters (lets say 1, 2 and 3 for convenience) so you now have a 6/6 and all your evolve guys get a +1/+1 counter again. You then pay another 3 mana and remove all their counters they now have and get a 3/3 and they all get +1/+1 again. Rinse and repeat.
Holy shit.