Is it a creature or a permanent?
Personally, I quite like the idea of lightning/spark generation; although it has been suggested in the past quite a lot.
This is extremely powerful creature control. Lightning is the most powerful straight damage card in the game, and proverbially "putting it on a stick" is definitely really powerful...
I would rather return to the spark/lightning generation idea.
Ability:
Static Build-Up: A random enemy creature or player is struck by lightning or a Spark is created.
Maybe then make the upgraded version spawn Ball Lightnings.
Then, maybe create a new card which works like Eclipse but only for Sparks and Ball Lightnings - this will cause a player to use two cards, but will give the Aether God a very dangerous creature-spam ability: 3-1 Sparks and 6-1 Ball Lightnings? Although, it will be balanced by the fact that the Spark does not trigger on every cast, instead, it could be say 50/50 or even 60/40 in favor of Lightning.
Nice idea though
. I was worried for a minute you would have gone the road of Parallel Universe on a stick