infinite loop
Loop detection, please do something for loop detection, it will not be difficult and you may prompt something like "how many times do you want to repeat this etc"
It ruins the game when you need to wait minutes for another opponent to finish doing something tedious and is annoying form the executor as well (I did it too).
Also they use it to trick the system, last time during my turn they started the combo and even if I was going to win the system gave us a draw for timeout.

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TheJim22#36836 commented
This is EXTREMELY easy to code and is an absolute MUST! Simply allow us to record a series of actions as a macro loop and let us choose a number of times to execute it. **** if you hired me for a week I could code the thing myself and I'm a novice coder. It would really only take a couple minutes to code it but I'm accounting for the possibility of needing to learn archaic code to determine where I could inject the method and have it work.
This is exactly how it works in paper. Demonstrate a loop and state how many times you're doing it with opponent able to say they have a response at a particular point. Simply give the opponent priority during the first 2 executions of the loop and if they don't respond by then resolve the rest of the loop.
It's terrible either playing a combo with a loop or playing against one because people feel the NEED to force them to execute the combo in case they can't execute the number of clicks necessary before the rope forces them to pass the turn. It means both players end up wasting 10+ minutes in a game where one of the players have a guaranteed win if it were paper and neither player is having FUN!
It's absurd this request has been over a year with no comment and I'm sure it's been requested several times prior to this. PLEASE WIZARDS do something about this!