For 6 of your turns every capture by either side drops a soul in the pot. When time is called, whoever made the LAST capture summons the pot: 2 souls a pawn, 4 a knight, 6 or more a rook, placed in their half. No captures, no winner.
You draft Progressive Jackpot in Buff mode. Passive: it works on its own the whole time you hold it, with nothing to activate.
As a pieces card, it summons, revives, promotes, or converts a piece.
“The pot does not care whose blood filled it.”