Not sure if this goes here, but Feodum will never not be my favorite alt-victory card, and I say this is someone who generally tries to avoid getting too many silvers in their decks if possible.
Feodum's a classic example of a card that may not seem OP at first glance, but can be extraordinarily powerful in the right kingdom.
Feodum+Delve is one of my favorite combos in the game.
Feodum+Masterpiece is great, too.