I think that Topps has done an amazing job with the various Mars Attacks releases. After 2015 Mars Attacks Occupation came out I was on the hunt for the Woodcut Art cards because of how distinct they are compared to other inserts from the set.
What makes these Woodcut Art cards different is how they are printed and the ink that is used to print them. Instead of a modern day printing press they use a Heidelberg Windmill Platen press which literally presses the paper against the printing plates so only a couple of cards can be printed at a time instead of an entire sheet. Second the Mars Attacks cards are printed using ink that is made up of fragments from the Martian Shergotty meteorite that struck Earth in 1865, Topps misspelled the name on the back of the card. The Dinosaur Attack cards are printed using ink that is made up of fragments from a T-Rex fossil.
The insert set uses image from the base set and was made up 8 cards in the Mars Attacks woodcut cards, which are all red, and 4 Dinosaur Attack woodcut cards, which are all green. When I purchased the cards in 2015 they were about $10 each.