The key cards here I think are Menagerie, Border Village, Outpost.
I think you want to trash down quickly the the beginning. So a standard Chapel/Silver opening. Add a second Silver and a Poor House to get to six coins, grab Border Village/Outpost ASAP for the +buy. Then Menageries and a single Gold. Maybe add Masquerade. For opponents Masquerades, it might be best to hold onto some junk cards. With all the trashing and passing going on, IGGs can and should be ignored. Along the way, a single Bishop should be added. Once your deck has 1 Silver/1 Gold/1 Platinum and a Poor House as payload (getting to $11), and enough Menageries to consistently draw your deck (and at least two BVs), you can buy and trash two Colonies/turn.