The limitation on effect based on the colour of the card is pretty minor in this archetype
To test the print layout, a series of Pokmon cards were printed onto the stock Wizards already had lying around for its other game, Magic the Gathering
In a game where players are often looking for more ways to add cards to their hands, the double whammy that Heffalumps and Woozles offers can be a very useful one

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An old, rare card might be pricey even if unplayable due to scarcity, while a mythic rare needs demand to be valuable