There’s an excellent monogreen Nissa available as well, but why not use blue? Actually, I’d rather use a monocolored deck in this particular environment, but I do have a fondness for Simic. Maybe we’ll get back to the other options later on. There’s Rashmi, Eternities Crafter as well.
No Elven Mystic available, but that part of Standard seems to be permanently over. However, there is several fairly efficient manaproducers in the format, like Servant of the Conduit and Rishkar, Peema Renegade and then there’s these two:
There’s also Kiora, Master of the Depths, which might work, but I wouldn’t bet on it.
Of course, the cards that really have an impact don’t always need to be the mythics.
This seems pretty good.
Its way too early to tell what kind of decks you can actually play in the format, but why would I let that stop me? Therefore, this little idea:
We don’t have decent scans of Nissa yet, so here’s the gist: She’s basically a worse version of Civic Wayfinder (less usable creature class types and can only find forests), but if you have seven lands in play, she flips. The planeswalker version reveals cards of the top of your library. If its a land, you get to play it immediately, otherwise you put it into your hand. The -2 ability produces a legendary 4/4 elemental and the ultimate ability makes six of your lands 6/6 elemental creatures.