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As the ruling states: If a creature returned to the battlefield by the unearth ability would leave it for any reason, it's exiled insteadunless the spell or ability that's causing the creature to leave the battlefield is actually trying to exile it
It's a Standard legal set, the first Universes Beyond product to be playable in (what is ostensibly) the game's main format
That being said, this card becomes a lot better if you can manage to give it lifelink
With Vintage-level cards, CEDH demands strategic play and deckbuilding
The artwork is already pretty funny, showing a wizard attempting to use a library card to check out a gigantic stack of books, and the effect has you draw your entire library/deck and use the entire deck as your hand