Alongside this, old cards sticking around should also prolong their usefulness, making purchasing a Standard deck somewhat more viable
One thing holding back the deck in prior incarnations was the difficulty faced in getting the right cards into position in order to bring out your top-draw Galaxy-Eyes Xyz monsters like Number 90: Galaxy-Eyes Photon Lord and Galaxy-Eyes Cypher X Dragon
For each card type among cards in your graveyard, Emrakul costs one generic mana less, which may seem trivial, but in a deck that runs four copies of Obviously, the main value that Emrakul provides is the on-cast trigger, allowing you to Thanks to the recent reprinting in Seasoned Pyromancer Seasoned Pyromancer was once a Jund mainstay, back when Jund was the most represented deck in the format many eons ago
Couple that with the utility of Leyline of the Void, Rest in Peace, Scavenging Ooze, Lion Sash, and even Graveyard Trespasser // Graveyard Glutton and it becomes that much harder to justify running this over the competition