Favorite tech card.... it's probably Small World, the fact that you can just search anything... from kaijus to handtraps to starters to extenders to literally any meme card... it's just fascinating to me, and the minigame involved is so much fun, I love finding new paths in my deck both to satisfy my curiosity and to have more options whenever I'm searching.
Also the fact it reveals for effect doesn't give away immediately what I'm trying to do