A number of cards have this effect:
The last oath - http://deckbox.org/whi/The%20Last%20Oath
Seductive Delusion - http://deckbox.org/whi/Seductive%20Delusion
etc...
Is this printed power?
Or does it change? Example - Let's take Troll Slayers in the battlefield with 2 developments. If they were corrupted with Seductive Delusion would their power be 3? Conversley, if they left play, and I triggered The Last Oath, would their power only be one since they are no longer taking advantage of the two developments now that they've entered the discard pile?
Another example of this type would be an Orc unit with Choppa attached. Is his power increased by 2 because of the Choppa if he is in play with that attachment on him?
Just wondering - there are many instances where this comes up and I've/we've always played it as printed power. Maybe I'm over-thinking it but I just wanted to clarify.
Thanks!