A few questions about Wind Up, Shadow Mastery, and Build Rapport

[Vertrucio]

I'm playing the standard build, not the Alpha btw.

How do I use Wind Up? As in, how do I actually discard it in a way that will trigger its damage increasing effect?

For Shadow Mastery, as above, what exactly triggers its discard? I've managed to trigger it a few times on a previous run, but now it does nothing for me.

Lastly, is Build Rapport bugged in the stable build? Because I almost never see the +3 Composure added to my Influence.

[pacovf]

For the first two questions, you need a card (or graft) that specifically instructs you to discard a card. Something like Survival reflex, or Rummage (from Fight Dirty). I agree that it could be more explicit that discarding them at the end of your turn doesn’t count (similarly, Wretched Strike could be more explicit about not counting the initial hand draw from the beginning of your turn).

Not sure about your Build Rapport question, last time I tried it on the experimental build it seemed to work fine.

[TF3]

Build Rapport applies its composure in the stable release, the ui is bugged and doesnt show the composure. You need to apply more composure to see it, or just let the influence get hit and see that it did indeed have +3 composure.