Way of the Turtle + Bounty Hunter + Castles
I just had a game where all three of those were in play. Also Replace, but that was a much less significant card. I bought several Bounty Hunters, and simply kept them aside when not needed. Then, whenever I'd draw a Victory card in my initial hand, I'd use a Bounty Hunter on it. Castles became a viable strategy. And since the Castles all have different names, Bounty Hunter would get a $3 bonus each time it Exiled one, making it that much easier to buy the next Castle! Replace added a bit of a bonus, too. Trash copper to Estate, normally not a very useful move, but since Estate would get Exiled quickly, they didn't weigh my deck down, and the cursing of my opponents helped. And Replace also helped to get some of the more expensive Castles as well.