Admittedly, gaining life on this sort of effect is historically more powerful, being more at home in midrange and controlling decks, but making the opponent lose life does make this card more at home in aggressive black decks
Nowhere to Run offers some removal and a way to get around both Hexproof and Ward, similar to Arcane Lighthouse but swapping Ward for Shroud
Any commander with a built-in mana sink can make fantastic use of all the excess mana that Seedborn Muse can grant you, to say nothing of casting spells
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With Neriv on the battlefield, a creature that deals damage on the same turn it entered has it dealing twice as much damage instead
This differs from tutoring where you look for the exact card you want from your entire deck and put it in your hand or on top of your library