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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

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

It can reduce the element of surprise and novelty

Avoid wasting your unused extra cards by knowing the ways that you can do with duplicates in Pokemon TCG Pocket

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