Before long, they would maximize their design space and end up making functionally identical cards with aesthetic differences, and the game would effectively become Reprints: The Gathering
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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)
We could talk about sample cards, which exist in very limited number because they were never officially released, or about the Pikachu card released on the occasion of a Pokmon Snap contest, but we selected the ones we like the most in their design or their originality, so forgive us if we forget your favorite card
Fire Energy (Pokemon Burning Shadows | Pokemon Cards) prices are based on the historic sales
Magical Cylinders X TRAP Set 1 "Magic Cylinder" directly from your Deck or GY