I bait out his Tyvar's stand so he's tapped out and after attacking have lethal on board. I use sell sword to fling a mouse and finish the match winning 2-0. As burn together resolves, but before the death trigger of Heartfire Hero can even be put on the stack, DRAW appears on screen and the game conclusion music plays. Meanwhile, the trigger resolves and hits for lethal putting opponent at -2 life in the background.

I'm not convinced this is a simple glitch. The timing of conveniently waiting until the trigger that would result in match loss is about to go on the stack is too much of a coincidence. As far as I can tell the ranked match ended in a draw so it's not like it displays one thing but does another.