You are reading Wrigley Wax post #666.
From Revelation 13:18...This calls for wisdom. If anyone has insight, let him calculate the number of the beast, for it is man’s number. His number is 666.
The beast's number is 666. But how many Cubs players had card #666? A quick check of the spread sheet gives me two.
Topps 1972 Hector Torres
Topps 1994 Steve Buechele
Neither of these two had beast-like seasons with the when their card was #666.
The Cubs traded Torres to the Expos on Opening Day, a day when the Cubs were playing the Expos. That must have made things pretty convenient; the traded players just traded locker rooms. His 1972 stat line with Montreal was 197 AB, .155, 2 HR, 7 RBI.
In 1994, Buechele's numbers were 387 AB, .242, 14 HR, 52 RBI. It was also his last full season in the majors. The Cubs released him in July, 1995. The Rangers picked him up, but less than a month later, they too released him.
For Cubs players, being #666 is not the mark of the beast, but instead, is the mark of the bust!