I am assuming that cards retain their card text while in the discard pile. This is how Necromancy is possible, as well a discarded King Kazador not being able to be targeted by the Mortis Engine or certain DE slave effects for free.
Under this assumption I have 2 questions:
Dark Acolyte's ( http://deckbox.org/whi/Dark%20Acolyte ) text box reads:
Destruction only.This unit gains the power of the topmost unit in your discard pile.
Also:
Abyssal Terror's ( http://deckbox.org/whi/Abyssal%20Terror ) text box reads:
Undead only. Battlefield only. Necromancy.This unit gains [P] for each unit in your discard pile
So - let's say you had 5 units in your discard pile, the topmost being the Abyssal Terror. I am assuming that he now has a power of 5. So if I have a Dark Acolyte in play, he would have a power of 6. Similarly If I have a Dark Acolyte as the topmost unit in my discard pile then I assume his power to be 2 (he gains the printed power of himself - 1+1 = 2). If I had another Dark Acolyte in my Kingdom, he would now have a power of 3.
Am I right here?