I've got a nice idea for the upped one that suits better to the stile of the card.
Hope you like. If I don't get to much votes I can go back to the last version (+3/3 instead of +2/2).
EDIT: thinking about your future comments. I have to say that you need 3 turns, 8

and 9

to destroy any targetable creature and that creature will have +4/4 before being destroyed (no way OP imo)
But you also could benefit yourself from the counters IF (big if) you play wisely. Because bad luck can give you the third counter and your "big mama" oty will pass away. But in any case, the cost is 6

to do that and there are still a lot of cards that can manage with that creature and some will still prefere to have the creature quinted instead of that.