Cool thread idea btw.
Let's think of other good targets. Procession on Death Cart is pretty good too, especially with extra buys.
How about Governor for cards and then Procession+Pillage. That would be really mean even with no $6 card on the board.

But even without Governor if you have a Pillage in hand and want to play it anyway playing Procession on it, might be actually good as you get 2 extra Spoils.
Out of the trash effect cards Fortress and Cultist are probably the strongest while Sir Vander and Catacombs could both pretty strong too, especially with strong $6 targets like Border Village.
Procession+Sea Hag is especially good with when you deal out the last 2 Curses.
Other good targets might be good targets that lose their usefulness after a while, maybe Ambassador or Moneylender.