Since the parameters of Brawl synchronize decks to a Standard environment, expanding Brawl historically into Eternal Brawl gives an opportunity to explore nostalgia for old Standard decks cheaper and in multiplayer
For example, if you control Muldrotha, the Gravetide ("During each of your turns, you may play a land and cast a permanent spell of each permanent type from your graveyard") and you cast a creature spell from your graveyard during your second main phase, you won't be able to cast another creature spell from your graveyard with Muldrotha's permission until after your next ending phase ends
These sorcerer queens wont be top-eighting any major tournaments, but since none of them cost more than a dollar, its worth trying them out
Get more tap triggers by using Puppet Strings and The Moment to untap Romana II
If Hydreigon ex knocks out a Basic Pokmon with damage from its attack, you take an extra Prize card