Secret Passage
Maybe the novelty will run out at some point, but I just love this card. Non-handsize reducing sifting is good anyway, but the ability to re-deck the card anywhere is just too much fun, finally enabling cards like Herald, Wishing Well, Vagrant, etc. I love putting the card somewhere other than the bottom or the top of the deck, which is what most other players do. I love that SP/junk in fourth position/SP/junk in second position/Sentry allows you to trash two junk cards reliably. I love that you can SP from a hand with terminals and no village, draw a village, then put a second terminal in sixth or seventh position in case your subsequent village/cantrip/draw sequence fails to turn up another village, allowing you to save it until next turn rather than draw a bunch of actions dead.