Rules for the Premodern format can be found at:
https://www.premodernmagic.com/

The goal with this cube is to create a draftable environment that helps dredge up nostalgia and reminiscence about Magic's early years. Using the card pool of legal options for the Premodern format, this 540-card cube is designed with both straightforward archetypes such as Goblins, Rebels, Zombies, and Ramp, as well as more dynamic, complex archetypes like Flicker, RecSur, Enchantress, and Lands.

I'm currently still iterating on this list and looking to pare down the cards to a clean 540. Playtest drafts and input are always appreciated, and you can get in touch with me on Twitter at @CovetedCat.