When using the Bender event 'Mimic', if you look at an opponent's hand and there are no events, does that mean the Mimic event is wasted? If so I feel it's a waste of time playing it as you might as well use it to build magic rather than risk discarding it.
No events means you don't steal anything. BUT you get to know what cards they had in their hand, which in turn means knowing what to expect from them down the line.
I almost never build Mimic, as even the threat of Mimic is really strong to force them not to hold on to their Events, or to risk losing them. I feel that the price of 1 Magic to know what Champs they have is worth it, and stealing an event is icing on the cake. Your own mileage may vary.