Regarding online-only promos: a version of Possession that said "the deck of the Possessed player returns to the state before the Possession turn" would be nice (it has some issues with Masq, Amb, MadMan and Spoils , but maybe they can be worked out). My point is that, in principle, Possession does no harm to the Possessed, but it surely looks like it does. If the possessed does not "lose" the turn, then it really looks like what it seems to be: a complicated more powerful version of Smugglers.