I know I can play one power card per turn, but is there a limit to how many I can have active at any given time? Playing vanilla btw.

In vanilla there is no limit beyond only one per turn, IIRC. The sky's the limit as long as you can put together enough threat for all of them. In my experience there are definitely times when it's better to ignore the big bad cards (or even use them as fuel) to hit the heroes with lots of pits and blocks and so on in rapid succession.

Awesome, that's makes things more interesting. And I believe I read somewhere that power cards are stackable. Is this correct?

mastrcbaoth said:

Yes.