-3 hyena umbra-3 harrow

+1 lightning bolt+1 titanic ultimatum+1 naya charm+3 selesnya charm

-4 weird lands+2 kessig wolf run+1 red/green scryland+1 basic

Love the idea. The only thing I could think of is using Lightning Helix maybe instead of the bolts just for the sake of stalling. Also just because I love the card and you may have the land for it - Scute Mob

I recommend adding some Restoration Angel and maybe replace the Elders with Farhaven Elf or add them in so that you can flicker them as well for additional land. That way you can use the Cloudshift to flicker and ramp early then Resto the Razer and swarm even harder.

i have a pet project built around the landfall mechanic if you need ideas Growing Strong

I'm a little leery about Farhaven Elf. Since it costs one more then the elders, I'm not sure I want to use it. I also like the ability to hold onto an Elder, and get a land whenever I want it.. I also don't use enough bounce or flicker mechanics to abuse its ETB effect.

Restoration Angel is awesome, but once again, her ETB effect is best on the Realm Razer. It will take too much time trying to build up 4 mana after Realm Razer's effect to play her. The deck's low mana curve helps guarantee there be something to play after Realm Razer exiles everything.