What old cards have you found with a unique effect?

Says it right in the tin, what (old) cards have you found by browsing Scryfall or rifling through discount bins that have such a unique effect that you love running them. Or rather, what unique cards do you wish you could find a home for?

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For me one of my most recent finds was [[Chaos Moon]] + [[Blood Moon]] in a deck with free sacrifices to ensure double mana for you and colorless for everyone else.