In short, The Scarab God is simply the best card in these colors for a variety of deck archetypes, and tokens are no exception since you get token generation and payoff in an efficient 5/5 body for 5 mana
Detonate Megaton's Fate deals 8 damage to each creature
Its adventure card, Ardenvale Fealty, lets players pay just two mana to create a 2/2 white Knight token with vigilance at instant speed
Dragonclaw Strike Dragonclaw Strike nicely sets you up to eat one creature, then bash in with your now huge creature
What might be a problem with Storm in commander, but some people would consider an advantage, is that you can play Storm pay-offs in basically any deck
The greatest strength of this format is the diversity of options and expression available to players, and Warhammer 40k is just another new way to push that diversity even further