I won the match, but I shouldn’t have. What you see in the replay, which is correct, is that in the last play I take 15 damage and end up with 5 life, while the opponent has 3. What happened in Arena was that I ended up at -15 life and still won the game. There must have been a bug — I shouldn’t have been at -15, and the game shouldn’t have ended, let alone in my favor.