No [scryfall]Elven Mystic[/scryfall] available, but that part of Standard seems to be permanently over. However, there is several fairly efficient manaproducers in the format, like [scryfall]Servant of the Conduit[/scryfall] and [scryfall]Rishkar, Peema Renegade[/scryfall] and then there’s these two:

There’s also [scryfall]Kiora, Master of the Depths[/scryfall], which might work, but I wouldn’t bet on it.

In the current meta, ramp might even work, because removal like [scryfall]Harnessed Lightning[/scryfall], [scryfall]Fatal Push[/scryfall] and [scryfall]Grasp of Darkness[/scryfall] don’t kill most big creatures. We might also want to avoid artifacts here.

So, what do we ramp into?

Here’s a few ideas:

Since there’s already a beginning of a energy theme, we might do that as well.

… and finally, [scryfall]Nissa, Steward of Elements[/scryfall].

[deck]
[creatures]
4 Servant of the Conduit
4 Channeler Initiate
4 Weaver of Currents
4 Longtusk Cub
4 Rogue Refiner
4 Bristling Hydra
2 Rhonas the Indomitable
1 Aethertide Whale
4 Elder Deep-Fiend
[/creatures]
[spells]
4 Attune with Aether
3 Nissa, Steward of Elements
[/spells]
[lands]
4 Botanical Sanctum
4 Lumbering Falls
10 Forest
4 Island
[/lands]
[/deck]