Like, Eldrazi aside this is absolutely nuts assuming you have enough of a power curve/make small enough tokens to trigger evolve on them often
the other face's characteristics are ignored
Depending on the format, you can use your trusty turn-1 Llanowar Elves to set up your future plays, or you can use cards like Elvish Archdruid and Priest of Titania to produce tons of green mana depending on the number of elves you have on the battlefield
You also had to worry about running into Icy Manipulator
That's very powerful in going wide decks like midrange, Zombies, Boros Aggro, Selesnya or Orzhov Tokens, and more
See their post here: I find it a bit unusual that they decided to ban cards that were so popular and have been around for so long, but they offer a pretty good explanation in the article: its experimental