For starters, you gain one lore whenever its exerted, and on top of that, its an Evasive card, meaning few others are able to actually challenge it, which is crucial when it comes to climbing the ladder to twenty lore
If you're playing against particularly aggressive decks that tap all the time, Calamity of Cinders will be of limited use
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Gavi, Nest Warden: Timeless Wisdom This commander is definitely one of the most
It can also be tutored out with Green Sun's Zenith
In Equipment decks that can consistently cheat it into play for cheap (Stoneforge Mystic) and get around equip costs (Puresteel Paladin) then yes, it's good since it gives a bunch of highly desirable keywords all in one card
