90% of the article about Pearl Diver could be filed under "when is a raw cantrip better than nothing?" It probably should be edited out of Seaside 2nd Edition, if anything.
I think a Pearl Diver article would essentially be the "better than nothing?" article with a half-dozen edge cases tacked on at the end, if that many. Vassal, Mystic, Jack of All Trades, Duchess. Mostly just Mystic, though. Maybe some fan cards.
Whenever this becomes the top card of your deck, take your -1 Card token.
Whenever you shuffle your deck, put this card on the bottom.
Setup: Add Wishing Well and Pearl Diver to the Supply.
(The back of this card is unique.)