SW_021 stands for Soft Ware and the Card Number.
Software Cards are essential to your survival on the Battlefield: How To Play?
Most of the Artwork in the Gallery was created for a Comic and converted into Cards.
In the product description I will note for which Story they were drawn and which episode.
These were drawn back in 2016~17 for a Heavy Metal Magazine named; Metal On Loud!
Following a Squad of ragtag clones in a special weapons outfit of the Heavy Metal Infantry.