can someone say something smart about possession that I haven't heard before, even if it's wrong? I feel that I've read all the conventional wisdom on the card and still don't understand it at all.
to wit, I think I understand:
1. it can be a trap.
2. the card interactions as described on this article, which is now missing a couple expansions. (i don't think there's a cornucopia or hinterlands card that has a substantially new kind of interaction with possession from an old card, although once someone won a prize i deserved while possessing me and that made me sad.)
http://dominionstrategy.com/2010/12/03/alchemy-possession/3. broadly, possessees have to worry about trash-for-benefit and "make the card leave the deck without trashing" (island + ambassador + masq) and possessees benefit from attacks, gain-to-the-hand-cards, alternate vp chips, and bad decks (but...).
i still have no idea what to do on over 50% of possession boards. usually i follow #1 and "ignore it," but this isn't always right.