This card is a Bodyguard card, meaning it can protect other cards that are being challenged
Complimenting its massive scale, Emrakul, the Promised End has flying, trample, and protection from instants, allowing it to both easily deal damage and protect itself from instant-based removal
In the right build, this often draws four, six, maybe more cards
Maybe they wanted to avoid paper copies of complicated reconfigure creatures, since those involve a lot of moving pieces already, but the general Magic populace can handle effects like this
But particularly in-demand sets often see booster boxes rocket into the hundreds or even thousands of dollars, as stock becomes more scarce
Finding a first-edition non-holo of the Dark Dragonite is extremely rare and highly sought after