Black Market

Favor.

Fast. Play at the start of the investigation phase. One at a time, reveal cards from the top of any investigator deck(s) until exactly 5 cards have been revealed. Set those cards aside, out of play. While set aside, any investigator may play any of those cards as if they were in their hand. At the start of the next investigation phase, shuffle each of those cards still set aside into its owner's deck.