If you are going to use Arbor Elf you might drop the Rootbound Crag s for Cinder Glade its also a mountain forest like Stomping Ground .

For ramp i like the arbor elf, you might add Utopia Sprawl it is just a very good ramp. Turn 2 you have 5 mana.

Oh before i forget on the land front. Dude .. dude... Arena

Just an update for folks still commenting here. Although I am guilty of commenting as well (questioning Arbor Elf, above), there is no point in it anymore. This deck was made 6 years ago and not commented on since. It's obvious this was meant as a standard deck during Innistrad/RTR (just prior to M14, looks like). He/she used Arbor elf because that's what was legal.

I was confused, probably like most others, because at some point tapped out started reverting old standard decks that were/are no longer legal to "modern" decks automatically. Maybe it's just to keep stuff organized, since these decks technically aren't standard-legal anymore, but it can lead to confusion in situations like this. People just need to be more aware of date posted/modified in these cases.

TLDR: Ain't no one listening to your suggestions, and OP did have a reason for using Arbor Elf. Mystic wasn't legal 'til M14.