In Commander, Dromoka naturally fits creature-heavy, midrange strategies that want to apply pressure without worrying about counterspells or combat tricks
Mana Geyser, if timed right, can generate a huge rush of red mana to easily cover all but the black and blue mana for Sauron
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Check out our review of Blood Rites, the Commander precon from Lost Caverns of Ixalan
Every deck that can run it, SHOULD run it, as the card is simple, incredibly effective, and allows you to get your game plan moving before your opponents can even react
I think its important to consider how well the decks play since these are intended as an introductory product