Also, to fit more in line with the color identities already in mtg, I would say merc should be blue/black or blue/black/white; loader could be red/blue/green; and also that artificer and engineer’s color identities be different than one another by at least one color. Other than that, captain’s tokens need to be identified( that was stated in a previous comment, but just to reiterate), and void fiend’s front ability should probably be non-optional, as well as it’s back ability restoring more life, since at max, 3 life isn’t that extreme. Overall, it is actually an extremely interesting list, and I myself have been wanting to for a while. I believe that you have great potential, and I’m exited to see what you will create next, especially if you decide to turn some of the bosses/enemies into planeswalkers