This signature mechanic exclusive to Rivals of Ixalan was reintroduced in 2021 in the Aventures in the Forgotten Realms Commander set on the card Orazca Relic
How do you do it without something generic like, "Make a token creature with X/X where X is the number of enchantments you control" or "Gain life equal to the number of enchantments you control," or "Return target enchantment from the graveyard to the battlefield," and such
However, following Wizards' own statement, we can expect the Stranger Things cards to make a reappearance sometime around the release of Streets of New Capenna in Q2, 2022.
In Vision Design's version, the mutation always went on top of the creature it mutated
Recomand si magazinul si produsele lor, nu cred ca mai e altul in Romania care sa il egaleze
And if you ask me, thats exactly what a universally accessible sideboard card should do