While not (yet) an officially supported format by Wizards outside of a few Arena events, I think its easy to see that Brawl on Arena has become wildly popular and Historic Brawl is a natural extension of that format
For example, if two players control a Ravenous Slime, a creature controlled by a third player will be exiled by the Ravenous Slime of that third player's choice, and the other Ravenous Slime won't get +1/+1 counters
Doubles as Realism-Induced Horror, since this is easily the most severe long-term ramifications we've ever seen from Jace's mental tampering, and on a person that considered him a friend and ally , no less
Bleeding Cool explains these five categories are Holo Rares, Reverse Holos, Ultra Rares (which includes VMAXs), Full Arts, and, finally, all of the Pokmon TCG 's Secret Rares (which includes Rainbow Rares and Alt-Arts)
And while historical events should always be evaluated in the context of their day (i.e
Special Editions and Variations The Great Wave - Matte Dual Art Sleeves are a special edition product, celebrating the continued success of AI Armor