Which brings me to my next point
Maybe if Deep Water turned all your lands into Islands, it would matter for cards like Engulf the Shore, Scourge of Fleets, or Vedalken Shackles

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Just be forthcoming about what youre selling, and dont try to trick people by acting like its anything other than a big box of commons
It can reduce the element of surprise and novelty
A more recent site, newer perhaps than many of the other answers is Scryfall, which uses some aggregate data from TCGPlayer and CardMarket to show prices for each different version of the card on the results page