Radiant, Serra Archangel isn't bad, or Ravos, Soultender for some graveyard recursion
As for how this all relates to your commander, each colored mana symbol that appears on a card in your deck must also appear on your commander
Kozilek, the Great Distortion is arguably on the softer end when it comes to the world-eating titans
[56] Loyalty counters equal to any damage the planeswalker takes are also removed
The grim-dark world of Warhammer 40,000 doesn't lend itself well to pure representations of morality, order, peace, and structure
Caring about the mana value of spells is a theme that runs in opposition to traditional Spellslinger strategies that want to chain together cheap, low-cost, and efficient instant and sorcery spells, and consistent token generation gives the deck a more impactful board presence to fend off attacks