There are several "variations" of this card. They run from the full color logo to the yellow/black logo. In between there are variations where the orange and red gradually disappear until all the is left is the yellow and black logo.
I would be surprised if there is a gray back version, since it would imply that the card stock was changed during the color depletion, or that the exact same depletion occurred during a separate run.
IMHO
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