Hsaka

There’s about a 5% chance Danaerys survives this season, and that may even be high

She either (1) Turns “mad” and Jon kills her or (2) Sacrifices herself to show she would, in fact, give it all up for the realm

Jamie, the “kingslayer,” will kill Cersei

And then the mountain probably kills Jamie, leaving Tyrion as the last Lannister

Jaime isn't dying at the mountains hands. He'll either die fighting alongside Brienne or while playing a pivotal role in taking down the Nights King, hence "Kingslayer".