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There aren't exactly many other good graveyard-blanking creatures in Modern
As for the X spells themselves, that includes a rich variety of Hydras such as Hydroid Krasis, which is overwhelmingly strong even without Zaxara there to generate additional value on the side, along with other staple Hydras like Lifeblood Hydra, Protean Hydra, and the mighty Genesis Hydra
Uthros might not be an artifact, but its part of the Planet cycle in the main set, and that means it gets better when you put on charge counters
That's a pretty powerful draw ability in a sacrifice deck, reminiscent of Morbid Opportunist, but more restrictive