The worst tactic I can think of (and works almost every time) is when your opponent let the timer run (wasting a lot of time) and make you think they’re afk, then when it comes to the right time they use a game changing move to surprise you… Really hate those people, just play moves normally don’t waste time or try to trick your enemies by pretending to be afk, there are much cleaner ways to beat your enemy with skill…
Its a waste of time and its VERY annoying