Once it's on the field, it becomes repeatable land destruction so long as you have three mana to pay and it can tap
Personally, I find this to be a promising idea
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Use Faerie Bladecrafter's power from when it was last on the battlefield to determine the value of X
While there may be more efficient reanimation cards available, Unearth's low mana cost and flexibility make it a solid choice for decks looking to maximize graveyard synergies and maintain card advantage
Which, more often than not, triggers dies as a mechanic, advancing Sephiroth closer to his transformation and Aerith herself has a special rule that, when she dies, her accrued +1/+1 tokens can be given to all Legendary Creatures you have in play