Sealed Arena Open timer
Edit: though there may not be a choice in order to get the event done in time? Maybe just a clearer indicator? Call attention to the time limit somewhere? I didn't see the details anywhere. But I think it only really happened because my deck didn't have enough power.
Ended up playing defense in a board lockdown until my opponent decked themselves first game. Really brutal to play my first Day 2 and only find out it is a match timer and not a game timer when it makes the 5 second countdown noise in game 2. Explains why my opponent chose not to win game 2 with Provoke the Trolls directly and just clear out my board instead.
Not sure a non increment timer is ideal for limited where lockdown happens so easily. Had fun though.