Approach of the Second Sun will keep on automatically casting itself once put on the stack
Casting Approach of the Second Sun in a Pioneer game, through the ability of omniscience having less than 7 cards in my library makes approach never leave the stack, and repeat casting the original copy. This makes me unable to do anything on my turn, and eventually time out.
Here are some screenshots that I took when the error ocurred.
This happens to me too every time I cast the spell (in at least 4 games now). It does not matter how many cards you have in your library. When you cast Approach of the Second Sun it never resolves. It just sits on the stack and you gain 7 life every time you hit ok until you either run out of time or someone concedes.