I was able to obtain another card of Herschel Walker from this set, which has plenty to choose from. The 2006 Playoff Absolute Memorabilia Tools of the Trade featured, Material cards, with a game worn item swatch; Double Material, with two swatches, as well as cards with no swatches in Black, Black Spectrum, Blue and Blue Spectrum.
The Tools of the Trade cards with memorabilia swatches were: Black Spectrum, Double Black Spectrum, Blue, Double Blue Spectrum and Material Red and Double Material Red.
The card shown is the Material Red, with a single swatch. These were serial numbered to 100, with this example being # 16.
From what I can tell, there are 12 possible different Walker cards in this set, of which 5 are in the Hoard. They don't come up for sale too often.