Here's another simple one: Get 2 peddlers by (the end of) turn 2.
Baker in kingdom. Shelters. Open 4/3.
Turn 1: Buy Nomad Camp
Turn 2: Play Necropolis, Nomad Camp, (Peddlers cost 4), play 3 Coppers + 1 coin, buy a Stonemason, overpaying 4.
Yep, I was wondering if there might be another way but I doubt it.
Player 1 buys Noble Brigand, revealing Overgrown Estate and Hovel from each of Players 2, 3, and 4. (You're Player 4.)
Player 2 buys Stonemason + 2 Masquerades, draws Necropolis/Copper/Copper/shuffle/Masquerade/Masquerade.
Player 3 buys Stonemason + 2 Market Squares, draws Necropolis/Copper/Copper/shuffle/Market Square/Market Square.
Player 4 (you) buys Stonemason + 2 Squires, draws Necropolis/Copper/Copper/Squire/Squire.
Player 1
Player 2 plays Necropolis/Masquerade/Masquerade. You get both Market Squares from Player 3 for Coppers.
Player 3
Player 4 (you) plays Necropolis/Market Square/Market Square/Squire/Squire (for buys). Play 2 Copper. Buy 2 Stonemason, gaining 4 Peddlers. Buy 5 more Peddlers.
Can you get all 10? I can't.
I can:
Baker (or Black Market including Baker), Noble Brigand, Stonemason, Masquerade, Border Village, Talisman, Squire and Peddler in the kingdom.
Turn 1:
Player 1 buys Noble Brigand.
Player 2 buys Stonemason and gains 2 Masquerades.
Player 3 buys Border Village and gains Talisman.
Player 4 (you) buys Stonemason and gains 2 Squires
Turn 2:
(your hand: Necropolis, Squire, Squire, junk, junk)
Player 1
Player 2 plays Necropolis and 2 Masquerades. You pass the 2 junk cards and receive Border Village and Talisman.
Player 3
Player 4 (you) plays Necropolis, Border Village, Squire (for buys), Squire (for buys) and Talisman.
Peddler costs 0$, you have 5 buys, and for each of the buys you gain a copy from Talisman = 10 Peddlers.