There's no way you get a better creature for only 4 mana in the Oldschool format, which is also why it's heavily wanted
Emrakul can't be countered, has an extra turn cast trigger, and it has protection from colored spells so like, once it's on the board there's not much usually anyone can do about it
Even once prices settle in a couple of weeks, this is likely still going to be the case
Even in cEDH, this can be a relatively budget option because one can play many lands in the deck to get them with Ad Nauseam, and the deck doesn't necessarily need all the top-end, old dual lands
Rarity : Common Cost : N/A Colour Identity : Colourless Usage : Provides flexible mana fixing based on your tribal commander, enabling access to any colour of mana needed
Zombies are great because there are a few lords that are simply playable without further support