Hmm. I do like the idea of Auras with "Living enchantment", but this is a rather fiddly way to do it, because the Aura spell still needs a target creature that's not the token.

Also this doesn't say "change ~'s target to that token" which means that if the target creature gets bounced or shroud before the Aura resolves, the Aura will be countered even though it's not going to do anything to that target any more. But this is easily fixable by making the kicker effect change the Aura's target. It still doesn't help with the need-a-target-in-the-first-place problem though.

I know that it wasn't right, but I didn't really know how to fix it, so I just put it up anyway. I wish it could be as simple as Living Weapon.

What if it eschewed the kicker, and instead had something like ": Put a 2/2 blue elemental creature token onto the battlefield, then put ~ from your hand onto the battlefield enchanting that creature. Activate this ability only any time you could cast a sorcery." Would that be too good, being uncounterable?
I'm just brainstorming.

That's the usual approach. I think it's the one that one of the GDS2 finalists used. It seems reasonable to me. (You can argue whether you want the tokens to be 0/0 and have all Auras with the new mechanic give toughness boost or not; there are arguments both ways, as there were with living weapon.)

Hmm... I remembered there being a bunch (?) of people who did "Living Auras" for GDS2, but I couldn't remember the solutions.