mtg card values online Insider: The Theory of Magic Pricing ≫ MTG Paths of Tuinvale
Description
For aggressive decks that are always ready to attack, this is basically converting mana (the you need to activate Fire Nation Palace, plus tapping it) into thanks to firebending

While I consider power, I also consider the uniqueness of the commander and how it stacks up against existing commanders in the same archetype
Drawing three cards as an instant for a single blue mana is so ridiculous that nothing even remotely close to this card has been attempted again in Magic

This is because it can really shut down Commanders, since it forces all legendary creatures to enter tapped and then keeps them from untapping

They did explore the concept of making a Warrior of Light commander players could make their own in some fashion, but Holt says those ideas had some pretty in-depth executions, and that your own personal hero still has plenty of moments in this deck even without being at the helm

Many legendary cards have higher costs to compensate for their stronger abilities, so Kethis giving you a flat one generic mana less cost for them helps get you in the game faster
