-0/-21 would be enough to kill any creature in Commander, yet Wizards leaned into the franchises lore
Thantis, the Warweaver is somewhat interesting as a Jund Spiders commander, although as a creature, it's mostly just a big creature that is likely to get you killed if you're not prepared by forcing opponents to attack
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Adapting something for a game-based property is more about capturing the universal experience of playing the game than it is necessarily capturing specific narrative moments, and each player will experience the same game in different ways
At least you gave it some stats, so guess that means something
Tales of the Ancestors Blue is the color that least needs catch-up cards that refill your hand, but some styles of Izzet and Simic can play out their hand quickly, after which Tales of the Ancestors can be used to refuel