Yah huh. Extant controlled and erased timelines and killed universes. Cosmic.....not only ended the universe prematurely, he created his own universe and completely changed the laws of physics and reality. He used his power to send his universe backwards through time so that it would have been the only one in existence, erasing whatever came before it.
Solar is the big gun in this one. He's created multiverses. And he's my pick to win this. Extant might be able to stop him, but I don't know.
WCP? Compared to her opposition, she might as well sit down, wait, and pray whoever wins doesn't sodomize her too badly.