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Hazezon might be better for aggressive shells, but Yuma grinds better, and I think thats where the archetype that focuses on shifting lands between the battlefield and the graveyard wants to be
So treat any fixed number you see online as a snapshot, not a rule
It will turn life your foes lose into your life gained
You can only target a single player, and its a bad card if youre in danger, but most pure mill cards are made that way
While people will certainly play Kaheera, the Orphanguard (with Cats and Elementals being the most likely immediate homes), over the short-term, Kaheera will probably be stuck as the best card in not very good decks