That Black Market deck looks really juicy: lots of trashing, lots of +Buy, some draw, Ambassador, Scheme, Warehouse, Monument, Throne Room. There's a Fairgrounds. And Scrying Pool can counter Cultist quite well with the right support. If there was a village, I think you could win with a SP engine. But there's only that lonely Throne Room... I dunno. SCSN might be right, sadly.