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Sometimes this is done for flavour reasons (they needed a certain effect at a certain mana level, but the original printing doesn't work for a plane where, say, the Llanowar Forest does not exist)

However, there were also some new designs that first appeared in Delta which were eventually published in First Edition, the most notable being the dual lands, but also including cards such as Spell Blast and Conservator

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[1] Starting with Scarlet & Violet , Pokmon Tool cards are considered as a separate category from Item cards

The Pokmon TCG:Sun & MoonUltra Prismexpansion includes