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.
Wishing Pearl
Treasure
Cost: $3
+$3
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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.
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Setup: Add Wishing Well and Pearl Diver to the Supply.
(The back of this card is unique.)