Terrapin
Two decks come to mind that I've passed on and now regret. A 2nd edition Alchemical by Robert Place. I have the 4th edition now which I like a lot, but geez I wish I'd kept the other more colorful one too. Also the Hudes which I let go because I didn't like 2 of the cards--the 5 of swords (violent) and the Devil (distasteful)--and you know how if a card you can't get on with surfaces in a reading, well it just messes up you mojo... Sigh. Feel pretty dumb about it now. Hopefully lessons learned.