Metal Gear is one of my all-time favorite game franchises and I absolutely love Yoji Shinkawa's character design and artwork. I've been disappointed since Neon Dynasty came out that I couldn't get his promo art for Satoru Umezawa into this cube, but thankfully his upcoming Secret Lair release gives me another opportunity to get his artwork into this cube.
Colorless
I think both of these are just straight-up upgrades. The artwork is obviously the big driving motivation for these changes, but both cards are better than what they're replacing. Metamorph is kind of cool as I couldn't really get Jin-Gitaxis into this cube due to power level concerns, so I'm glad this affords me an ability to get some Phyrexian representation into this cube given the story of the set.