I would have a tough time scheduling the round changes any time other than Friday or Saturday nights, but I feel like I should be involved. I guess we don't have any room for schedule slip either. I'll think on it until tomorrow but certainly encourage others to come forward.
bravelion, no worries, I certainly didn't deduct for the flavor text, sorry if it came off as brusque. I was just typing comments quickly as they came to mind.
I think the other construction that works is "He will not be content until there are no wings in the sky," or something, but that's a double negative that is vaguely frowned upon. If you use "until" it implies that there are no wings in the sky now, and he will start being happy when there are. Since you want to say there are wings now and he will start being happy when there aren't any, "as long as" is the best choice.
I thought the name and body sounded familiar but I forgot what the other one was called. I still think you can straight-up outclass it at rare though. My logic here is that you would basically never play the existing giant outside of Limited, where it was fine. Your card is also technically a drawback for your flying creatures, but you would be better equipped to exploit the drawback, so it's totally fine to bump it up (adding the ability) at that cost (4).
We've had Primeval Titan and friends and stuff like Ashen Rider, so sure having a ton of triggers to make sure your thing happens is value town and is a mythic power-level, but it just strikes me as over the top, especially for what it does. The closest Titans are Inferno Titan and Frost Titan and both at least technically had some hope of saving/using the creature.
Personally there's an aesthetic balance here where this maybe feels fine on a...7 or 8 drop? Something huge that has a huge body that seems like it could just kill everything. But the 3-for-1 5 drop is just too good. The flavor concept of your card is fine but Standard would not be fun and it isn't really showing me a new design, just something pushed.
As always, comments above are just friendly critique for the sake of discussion.
Any indeterminate token creators don't count for uniqueness.
If you can search existing cards for the string "[p/t] [color] [type] token" and find any results, it's not unique. Otherwise, you're good.
Adding legendary and a name or some other supertype/characteristic is fine as well - "a legendary 1/1 red Goblin creature token named Young Squee" is unique by my standards.
By unique token that was never created by any other card, do you mean creature type? Or mix of creature type, color, P/T and abilities? For example, is 7/7 red Dragon with flying unique?
That would be unique yes, no other card has created that token and in fact only one card has ever created a 7/7.
Even like a 1/1 blue Goblin token is fine I think, as long as nothing has made that exact token.