Your opponents are free to enchant your creatures with Auras (like maybe ones that stop them from attacking because they're no fun) without fear of causing them to become modified
That said, its mostly used to redirect removal spells as its base effect, and the copy effect only matters if you get lucky
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While Necrodominance is on the battlefield under your control, abilities that trigger whenever a permanent you own is put into your graveyard from the battlefield (for example, "When this creature dies") won't trigger because cards and tokens are never put into your graveyard
Upon entering the battlefield, it grants two life, and after dying, it returns with a -1/-1 counter to grant an additional two life
Sure, it's only once a turn, but it's also capable of triggering on your opponents turns, making it wildly good in Commander, where you have three other people playing