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Why does it look all buggered up like that? Goop Gas Attack was a real card from that set, but the printing on that particular one seems to have been botched.
If it's a misprint, it's one hell of a messed up misprint. Chances are a one-off misprint like this one won't be worth very much, even as a first edition. Most error cards are valuable because there are enough of them to verify they exist and aren't fake, but not enough that they are common.
You could always sell it as a One of a Kind/Unique card, you know? I'm sure some collector out there wants it. I know a card collector who has a binder just for misprints.