Probably too cheap given that it's a permanent, but with wizards printing shit like they do who knows anymore. The fact that's it's specific just means it's only going to be played in a few deck types, but in those deck types it's going to be very powerful.
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They will definitely make a card like this at some point, but G might be too efficient for a flashy version. I immediately thought of Bogles, but I don't actually know if it wants this. It's unneeded with the actual Bogles, but a version with only Lightpaws/Sythis/Spiritdancer could be made, though it would have a slower start. I could see turn 1 [[Utopia Sprawl]] into turn 2 [[Sythis]] with this as backup being very gross.
They're doing less and less "permanent hexproof" and probably won't on an aura 🤷🏻♀️ I mean, with the current thinking; that might change.
In eternal formats we already have Lightning Greaves and such, so in a Commander Legends type set this might see the light of day.