If the text only read "after your opponent summons a minion" instead of "after your opponent plays a minion" it would have been a good combo with Dirty Rat in the Wild. Right now I'm still scratching my head on how to use this competitively without being extremely lucky.
ConCuThanky1292 might be on to something with Treachery though.
So, what were they thinking with this card? Is the idea that it counters big priest? Is it to force them to play something small when they want to play something large? Is it to force them to play a minion when they want to play a spell? Does it counter spell Hunter?
What was going on in the design room on this one? I just drew it and would like to play it, but it looks like one of the worst legendaries ever printed.