I figured I'd give one of these creations a try
Retreat (4)
Victory card
Worth 1 VP
+ 1 VP per two retreats in the supply
+ 1 VP per two victory cards in the trash
First two are worth 4VP, that's big. Third is only worth 3VP and goes downhill fast from there.... unless there is heavy trashing in which case they can be worth a crazy amount of points.
Main problem with it is scaling for more than 2 players but I THINK it works out because the increased desirability reduces the actual value.