For a single mana, nothing else comes close
Expect woodblock-style borderless cards , dramatic full-art lands , and character-driven showcases that would make Yoshitaka Amano proud
Even the Warhammer 40,000 decks, which likely would have benefitted from an admittedly less profitable tie-in with the fantasy Age of Sigmar over sci-fi 40k, could skirt past without too much notice
While it's a fine card and scales throughout the game, there are a ton of graveyard-centric / reanimation decks in Commander, and it seems unlikely that Gyrus, Waker of Corpses will beat out most of the pre-existing options outside of something like Jund Hydra tribal (and then, it's not even that good with many Hydras since they are X-creatures, which won't work with the reanimation ability)
While building a 5-color deck can be challenging, it can be fun and strategic once you get the hang of the process
An excellent way to purchase codes directly is through the ecommerce stores