For a “pick 3” theme for a recent ATC swap, I picked these themes from the recipient’s list:
Dinosaur
Grid
Wings
A “bat-winged dinosaur” was discovered in 2015, so I drew it for this ATC. “Bat-winged dinosaur” covered themes 1 and 3, and the detail on the wings covered theme 2. They named the dinosaur “Yi,” which is why I wrote that at the bottom of the card.