When Green has good color fixing and mana acceleration (as it did in Theros), it completely dominates the tournament scene
You now get access to all your opponents cards exiled with void counters on them
Oh yeah, one last thing: for the rest of the article, rather than calling the decks by their proper names, we'll be going with their themes and color combinations, which are shorter and easier to type (as a refresher, Sultai Mutate is the Enhanced Evolution deck, headed by Otrimi, the Ever-Playful
On top of this, Amass is making a return, but replacing War of the Sparks Zombies with Orcs
Having the eternalize mechanic means you can do it twice, bringing back your cards to use again
It gives you a place to play your old Standard cards without worrying much about metas (though there is one) or anything like that