Incorrectly passed priority while holding instant and mana to play it
I passed the turn to my opponent holding the card "Wail of War." I planned to use it during the opponent's attack, giving their creatures -1/-1 until end of turn. This was of utmost importance. Their board was largely one toughness creatures. Opponent attacked, then played a spell the gave their board +1/+1. The game client gave me no opportunity to react. It simply resolved their spell, skipped to combat damage and as a consequence I lost the game. It ended my draft run. I had more than enough mana to cast the instant. I did not skip turn or hit space bar. There was plenty of timer left. Game just arbitrarily decided I should lose. Very frustrating.
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Rezzahan#77802
commented
Did your opponent control a Voice of Victory?