By the current wording i can play it as a Madman or Spoils and put it on the respective pile, covering the pile up and causing some confusion. I suggest limiting it to cards in the supply, as with BoM.
Also i suggest to borrow the "until it leaves play" from Band of Misfits instead of "this turn only". As SirPeebles said, the fact that Duration cards give you some benefit next turn is not at all dependant on them staying out, rule-wise. So even if this card leaves play after this turn, it will still have the duration effect later (having the card stay out is just for players comfort). So as you can't keept the duration effect from happening, just leaving the card in play makes it a lot easier to use. And then of course there's the option of ignoring the rules - but you'd never do that, would you...?
