So, in a game earlier today I realized the following: when you have horse traders in hand and your opponent plays a minion, you can choose between this hand and a new hand (since if you do reveal horse tradres, minion attack doesn't affect you because you only have a 4card hand). however, when you choose not to reveal horse traders in order to get rid of a bad hand, your opponent can choose not to let you discard.
so, it should also be possible to fake a bad hand by not revealing horse traders, possibly stopping your opponent from doing more in his turn because he doesn't want to help you. this only works because of goko's implementation, you know that your opponent has horse traders in hand even if he doesn't use it, but it seems interesting. anyone ever done it?