Since no one has come to argue for Yhwach, I will give my vote:
Kars starts with Whitesnake. Yhwach, seeing how Whitesnake can just take away his mind and soul, but also realize that taking it away in the future results in automatic lose, proceed to engage one on one. He considers using many of his Sternritter powers, but also sees that Kars just copies them. If he goes CqC, gets mind and soul haxxed. So naturally, he goes for the simplest solution; Soul killing arrow. But he notices how not only can Kars survive this easily, but also that, in many futures, Kars realizes the existence of the Almighty thanks to his perfect accuracy and prediction of his movements, so takes even more extreme care. Then notices the extreme differences in physical strength. The solution was way more simple. ***** slap that f**er. Oh, but wait... Kars cameback. How? He didn't saw any action from him. Nor an indication of any power in use. Kars now knows to not engage physically, so he keeps his distance. Yhwach then sees himself dying. He doesn't know why, but the next movement, he then experiences that same death he foresaw. A cat-like creature is the final thing he sees, before disintegrating.
Kars bit the dust, came back, stopped time, and made Yhwach explode. The end.
