These guys cant be easily blocked, and gets in there for nice three damage chunks
The more common cards are line infantry or support weapons, the uncommons are squads who play a named role in the backstory (including ones subsequently featured in the series of novels), the rares are either infamous and power units or named and often pivotal characters and the very rares are Primarchs, Titans and the actions of Horus or The Emperor
Although I would imagine they would have to dramatically increase the number of usable cards if they planned to do that
Decks will typically focus on a single Egyptian God, since many of their support cards only work on a specific God (e.g., "Ancient Chant" searches "Ra" specifically), and those support cards lack synergy between each other
Jeweled Lotus is equally polarizing, but ultimately, I believe, a fair card