Emrakul, The World Anew, although expensive to cast, offers different ways to play it early and can be powerful if utilized strategically
The card was first printed in Future Sight in 2007 as the third expansion in the Time Spiral block
Coincidentally, the first iteration of my cube was built from MODO set redemption, leftovers from my early paper days, and the Commander 2011 decks, with the latter providing some low-cost reprints and cube-worthy unique cards
It was almost the same as a repeatable Unearth, except that it could only be activated as long as you retained control of a land which you designated as that Mummy's "Tomb." While it was very flavorful, it required artificially seeding a lot of balanced but playable land destruction effects into the environment so that players can interact with that Tomb
In Brawl, you can only use one of each card excluding basic lands, and one of those cards must be a commander: a legendary creature or planeswalker that sits outside the deck and can be cast at any time
It's got flavor