Thank you very much for your explanation. I get it.
Maybe this is more of a strategy point now, but then it would seem that the main benfit of PA is to create an exclusion zone somewhere early in the turn, I guess to keep models away from the poltergiest, or to protect Pandora or some stratgeically importand area. If so, that kind of makes the 2Ca price a bit high it would seem, since that means you can't move the poltergiest before casting, and it has the option of using Pandora's 1Ca attack spells instead. So I'm wondering whether people rarely use PA, or if it's a staple strategy?