2 turns with 2 players:
P1: Play CCCCC, buy Lost City
P2: Play CCCCCC, Coin token, buy Travelling Fair, Mint, Alms(gain Rats, topdeck)
P1: Pass
P2: Hand is Rats, Necro, OE, Mint, C. Deck is Hovel. Play Rats, drawing Hovel, gaining Rats, trashing OE to draw Rats. Play Ratsx19, trashing rest of hand.
So close, but
you draw from Rats before gaining another Rats, so after you trash your OGE and play that Rats, you draw nothing so that Rats you gained isn't in your hand
Dang, I guess I need another player then.
2 turns with 3 players:
P1: Play CCCCC, Coin token, Borrow, buy Travelling Fair, Mandarin(topdecked), Alms for Quarry(topdecked)
P2: Play CCCCC, Coin token, Borrow, buy Stonemason Lost Cityx2
P3: Play CCCCCCC, buy Travelling Fair, Ball(gain Ratsx2 topdecked).
P1: Play Mandarin(discard C), CCCQuarry, buy Borrow, Travelling Fair, Stonemason for Lost Cityx2, Stonemason for Lost Cityx2
P2: Play Lost Cityx2, Stonemason OE for draw, CCCCCCC(Hovel Necro in hand), Stonemason for Lost Cityx2
P3: Hand is Ratsx2, OE, Necro, Hovel, CCCCCC. Deck is C. Play Rats, drawing C, gaining Rats, trashing OE to draw Rats. Play Ratsx19, trashing hand.