Ranger's Path and Skyshroud Claim are awesome ramp cards. The best part of how they are worded is that it does not have to be a basic forest card, if you happen to be running any. Explosive Vegetation can be a good one, as well.

Crystal Ball is really cheap and can help with filtering the top of your deck so Mayael hit her targets more frequently.

Also, sorry to say but Sylvan Primordial is banned in EDH, unless your play group doesn't care about that. Then, by all means go for it.

Your Woodland Bellower only has one target in the deck. Not sure if that is worth it. Maybe replace it with something with more zing? Hellkite Tyrant is a good one in my opinion.

You're off to a good start for a budget deck, but a few tweaks could make some significant improvements.

I would swap Borderland Ranger for, well, just about any other creature ramp card. Farhaven Elf, Wood Elves, Yavimaya Dryad, Dawntreader Elk, Diligent Farmhand, Solemn Simulacrum, and Burnished Hart are all great, and none of them (aside from maybe Simulacrum) will cost you much.

Armillary Sphere is fairly decent in just about any color but green. You have better options open to you. Wayfarer's Bauble and Mind Stone are the first that come to mind. Better yet, replace it with one of the aforementioned creatures. I'll take a creature that ramps me over a non-creature artifact any day.