DominionStrategy Wiki
I have played a colony game with King's Court, Highway, Feast, various powerful draw cards, and no +buy. Believe it or not, the correct strategy was to King's Court your feasts into stuff.
KC/Feast is awesome, but without seeing the board, I'm not sure I do believe it, 'cause I imagine it could be rather sloooooow.
This seems like the most obvious answer to me...?I have multiple buys.