Mandarin shenanigans to guarantee three consecutive Provinces and then a Duchy.
Stealth Tomato's turn 12
Stealth Tomato draws 2 cards and gets +1 buy from the Wharf.
Stealth Tomato plays a Wharf.
... drawing 2 cards and getting +1 buy.
Stealth Tomato plays 3 Coppers, 2 Golds, and 2 Silvers.
Stealth Tomato buys a Province.
Stealth Tomato buys a Mandarin.
... putting 3 Coppers, 2 Golds, and 2 Silvers back on the deck (in some order).
(Stealth Tomato draws: a Copper, 2 Golds, and 2 Silvers.)
Stealth Tomato's turn 13
Stealth Tomato draws 2 cards and gets +1 buy from the Wharf.
Stealth Tomato plays 3 Coppers, 2 Golds, and 2 Silvers.
Stealth Tomato buys a Province.
Stealth Tomato buys a Mandarin.
... putting 3 Coppers, 2 Golds, and 2 Silvers back on the deck (in some order).
(Stealth Tomato draws: 3 Coppers, a Gold, and a Silver.)
Stealth Tomato's turn 14
Stealth Tomato plays 3 Coppers, a Gold, and a Silver.
Stealth Tomato buys a Province.
(Stealth Tomato reshuffles.)
(Stealth Tomato draws: a Copper, a Province, an Estate, a Gold, and a Silver.)
Stealth Tomato's turn 15
Stealth Tomato plays a Copper, a Gold, and a Silver.
Stealth Tomato buys a Duchy.
(Stealth Tomato draws: 2 Coppers, a Province, an Apprentice, and a Mandarin.)