This is just as much a Commander ramp staple as Sol Ring, except this mana rock can fix your colors as early as turn 2
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
Omniscience_is_life says
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
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
Seeing so many cards just means you have the right stuff all the time