According to the sets official release notes from Wizards of the Coast, the battles serve as a thematic tie-in to the overarching story behind March of the Machine, where the cultist army of Phyrexians have launched their invasion of the entire multiverse
In the Pokmon video games, a Pokmon Mega Evolves via the use of a Mega Ring and the Mega Stone associated with that Pokmon
Every product in the Ultra PRO MAGIC: THE GATHERING FINAL FANTASY line features brand-new artwork of characters, creatures, and items, carefully arranged to upgrade your collection with your favorite FINAL FANTASY moments throughout the sixteen mainline titles
This is one of the reasons why the cards are so valuable today
But also expect to see it in Dimir, Izzet, Esper, and Jund lists among many others
While some of these cards are niche options that are only relevant against specific decks, others are played in almost every evolution deck in the format