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brian parkerI think the "Monster" checklist was designed to indicate for each card what back combinations did not exist. All remaining back combinations were to be viewed as to possibly exist, but this does not mean they do exist. Thus, according to his theories, the Wagner card could exist with eight different backs, as is shown on his checklist.
This is my theory on his checklist--he never really explains in his booklet what criteria he used to design the checklist. Nothing like basing theories on other people's unexplained theories.
Brian