[Standard / Maybe Modern] Changes to my existing RG Beatdown / Aggro deck

[weenaak]

Standard RG Beatdown / Aggro

I want to remove the 3 Pheres-Band Raiders and possibly the 3 Satyr Nyx-Smith. I just don't like the inspired ability as much as I thought I would. Here's what I want to add in their place:

+1 Kalonian Hydra (for a total of 4 in the deck)
+1 Molten Birth (for a total of 4 in the deck)
+1 Xenagos, the Reveler (this deck currently doesn't have a planeswalker)
+3 Chord of Calling (so I can tutor a Kalonian Hydra or Xenagos)

Standard rotation occurs as soon as Khans of Tarkir comes out at the end of September, and this deck will no longer be standard. I'm not sure if I will try to swap out cards to keep it standard, or call it modern (if it becomes a modern deck, then I might try to improve it with older cards as well). Because of this, I probably won't make any actual changes to this deck until at least October. So any suggestions you have from currently standard-legal or from modern will be interesting to me.