Cheating
"AI Dravenek" is cheating or this is a major glitch exploit. Maybe it is an actual AI, who knows. But I was playing on mobile, clearly ahead and one more turn to win, then all of the sudden the screen flashes like a card was played. No cards a are shown to signify what was played, then all of my creatures are now on their side of the board along with multiple other mythic creatures that were not there before. I hovered over each card and his graveyard, nothing played or in battlefield would have done anything regarding the effects that just happened. They did play a card that let them search through their library, but again, nothing said gain control of my creatures or repeat any thing. Not to mention, there was one effect and all of the cards and changes were played at once with no resolve prompts.
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[Deleted User] commented
Your opponent used Realmbreaker to bring out all of the Phyrexian Praetors. Most have enter the battlefield effects, and Elesh Norn, Grand Cenobite is what killed most of your creatures