if Nighmare penguin is once fliped up from face down defence position is his effect of returning i card from the field going to be continius every time is fliped from defence to atack position ?? :rolleyes:

If it is flipped facedown it's effect resets itself. Allowing it to return another card when it is flipped face-up once again. :grin:

Anytime he is f/d then face up his effect activates, and don't forget he's not a flip-effect so ceasefire activates his effect