That version of the expansion would’ve had some fun card mechanics, like investigations, mysteries, and ghostly switchups and replications. Of course, that theme, and some of those cards, were lost along the winding roads of development, but the “Ghostly” concept survived: as Echo cards.
Massively OP’s Andrew Ross sat down with the Blizzard devs at GDC earlier this week to hear all about the work behind the expansion, so don’t miss that before clicking onward for the vid.
Source: YouTube