I ended turn with two untapped swamps, intending to use them with Bayo, Irritable Instructor should he leave the battlefield since my opponent was at 1 life. Play shifted to their turn and my swamps were tapped without me doing anything. This resulted in me losing the game, which also cost me a win in the Traditional Draft event this was for. The only other things on the battle field were a Wardens of silverweb peak under my control, a Sadistic string puller under my opponents control, basic lands, and a surveil land that was already tapped...