Bug during Tainted Pact auto-resolving.
I have Thassa's Oracle ability on the stack and cast Tainted Pact.
I then proceed to time-out, because the fastest way to resolve the combo is letting it auto-decline after timing out. (please also consider fixing it so i can just decline all instead)
If my opponent concede while the auto-decline animation, it freezes and i LOOSE the match...
Screwed me over in an event.