I played this set 2p a few days ago:
Forager, Procession, Talisman, Royal Seal, Witch, Mystic, Bandit Camp, Minion, Cultist, Pillage; Shelters and Colony.
We three-piled on Curse/Forager/Procession (and only 2 Ruins left), final score 0 to -4, with me trashing my only Province on my last turn to get a buy to empty both Forager and Procession at once
. My opponent had been hitting Forager and Procession hard, but I opened Witch and then picked up two Cultists and just completely swamped him in junk.
I think it's a virtual certainty that a well-played Witch/Cultist game will 3-pile -- Ruins and Curses will be out, and your decks will be so junktastic that even if there's no other low pile, you can likely win on piling out Duchies before your opponent can rebuild and get Provinces.