A darned cool episode and one of the coolest episode posters in Season 8, "Ex Post Facto" lends itself to episode cards very well. By changing out the Discard Pile for the Resource Deck, the past becomes the present. The reversion of Faith, Giles and Xander to their past selves also works in and adds a little bit of flavor. Even if none of their cards are in play, the immediate effect of the deck-swapping makes this worth using.