Sandsteppe Outcast or Hushwing Gryff may do well as white 3 drops? Or even Abzan Falconer?

Though in testing the deck seemed to be able to have that 1GG needed for Courser of Kruphix. I believe you could run him over Yasova.

First off, thanks for the help and feedback, Carter. I think I'd run two Gryffs in the sideboard (perfect anti-whip/queen/Sidisi tech), and over half my creatures have flying, so the Falconer seems a little redundant. In my meta, the Outcast wouldn't be a good fit. Now, the other reason why the Courser feels like dead weight is because in multiple games, I had him in my hand and wished I had something more aggressive, like playing a Rabblemaster on turn 2, or I needed to play a Lightning Strike instead to kill THEIR Rabblemaster, and so on and so forth. It's not like it was the worst card to play, it's just it didn't do enough to help me push through the last bit of damage late game, and didn't give my deck what it needed early game. Maybe Fleecemane Lion?

I was thinking Fleecemanes

Have you looked at Alesha, Who Smiles at Death? In an aggro deck she can do wonders. What I dont get though, is if your aggro why are you running ramp. Youre curve is a tad high, but if you think Alesha is good you need good aggro 2-drops as well.

I would call this more midrange - not super aggro

Brimaz, King of Oreskos would probably be better than Monastery Mentor here, although might be a little tough on the mana. Fanatic of Xenagos is decent as well.

How good has Frontier Siege been? I'd probably play Outpost Siege for card advantage, or Xenagos, the Reveler if you are still looking for ramp.

Thanks for all the feedback thus far! I appreciate all the ideas you guys are putting out there. To address the new feedback in reverse order-

TClaw12- Brimaz has the same issue as Courser and Flamewake, and that's a double-color mana cost. You nailed the issue right on the head. I was thinking about Fanatics possibly, yeah, but I was also thinking about Fleecemane Lions, since they're a pretty good late-game drop too. Frontier Siege is great. It's super-effective ramp, and I have frequently cast it using three lands and a ramper (Mystic or Caryatid), and then, on the second main phase, cast a Caryatid, and then the next turn cast Dromoka and Stormbreath Dragon in the same turn. Outpost Siege is good, but I generally either want my creatures to stay (or they're so large, I'd rather keep them than ping for 1 damage) or would rather be casting something from my hand instead of forcing myself to play the top card, good or bad. Xenagos is great, but a little stricter on mana requirements, and dies to LOTS of removal, direct damage or kill. Enchantment hate is still relatively uncommon.

Oww99 and Bretters- This deck is midrange. I would do Alesha in a Jund deck with Hornet Queen, Nighthowler, Satyr Wayfinders, and Rakshasa Deathdealers. Fleecemanes are seeming something like a front-runner right now, though those Shaman of the Great Hunt still stick in my mind as a viable option. Any opinions on that?

I think Fleecemane Lions would do well to fill that spot.

Also, if you want more spot removal over Yasova, you could try Wild Slash.

Wild Slash is sideboarded. Lightning Strike hits just a tad more.

Take out 1 or 2 lands your curve isn't to high and you are playing 6 fetches so 22 or 23 should be fine and take out elvish not like your trying to ramp super hard and she doesn't really do much here. Add Nantuko Husk fits well in this kind of deck. Maybe add Gather the Pack and Kolaghan's Command.