This one requires you to be 2nd position in a 3 player game.
Turn 1:
Player 1: Buys Noble Brigand
Player 2: Buys Trader
Player 3: Buys Ill-Gotten Gains, player 2 reveals Trader, gaining a Silver
At the end of Turn 1, Player 2 has a 3 and a 4 cost card in his/her hand.