While it's certainly possible to get lucky and double your money with a box of Masters 25 even at current box prices, which are around $180$190if your goal is to build a Modern collection, you're probably better off spending your money on newly cheap Thalias, Eidolon of the Great Revels, Blood Moons, Utopia Sprawls, and the like
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Although Emert's transformed Hades form does cause further cards to be exiled instead of getting re-used again in the graveyard, there are plenty of ways to avoid the downside while still reaping the rewards
It's a battlefield
The drawback is that creature has to have a mana cost equal to or lower than the number of lands you have, but thats super easy to get around in green
