I managed to get 5 coin hands for the first 4 turns of the game.
Turn 1: 5x copper, bought Mandarin
Turn 2: 5x copper, bought Haggler
Turn 3: 2x copper, shelters, opponent plays Bishop, I trashed my Overgrown Estate, shuffle and draw the Mandarin, put the Necro back on top
Turn 4: Haggler, 3x copper, Necro. Play Haggler, 3 copper