I'd suggest this should be slightly more generic, something like "At the beginning of each combat, target creature gains flying UEOT".
I'd also suggest it shouldn't be quite so much better than Gaea's Skyfolk... a 3/3 flyer for 3 or a 2/2 flyer for 2 seem more sensible than a 3/3 flyer for 2.
Unless you wanted to go with a fading-type ability? "~ ETBs with 3 +1/+1 counters on it. At end of your turn, remove a counter from ~"?
Tum ti tum random abilities
I'd suggest this should be slightly more generic, something like "At the beginning of each combat, target creature gains flying UEOT".
I'd also suggest it shouldn't be quite so much better than Gaea's Skyfolk... a 3/3 flyer for 3 or a 2/2 flyer for 2 seem more sensible than a 3/3 flyer for 2.
Unless you wanted to go with a fading-type ability? "~ ETBs with 3 +1/+1 counters on it. At end of your turn, remove a counter from ~"?
Oh, I know it's not balanced at all. Feel free to balance things in general; I'm spitballing at things.
I like the generic ABOEC
More generic flying