

I think the deck should devleop further. I think the MonoRed version is OK, but I would recommend it only in a Meta that at least to some degree is made up of Languish decks (where Berserker is great), which seems less and less the case....
I currently see three principal directions in which we can take this
1. UR Dragons This would give us Dimensional Infiltrator and Rattlechains as a way to make Messenger Really good and Icefall Regent as Dragon # 5 and possibly 6 to have Draconic Roar be more consistent. 23 lands with 8 1-drops (Neonate + Messenger) is what we'd probably be looking at
2. Atarka Dragons I still think Atarka's Command is a great card that is difficult to miss out on and that your build has a lot going for it. I would be tempted to add a 2-3 Forests rather than the CIPT dual for consistency and max out on Ire Shamans and Abbots rather than playing Berserker, but have not tested that at all. Let's not forget that Den Protector is still a card, too.
3. RB Midrange Dragons If we want to remain aggro (which I firmly believe is right) I think we should start by adding Olivia's Bloodsworn - which of course can't block but seems to be the best of the bunch. I would try to go 25 lands and include a singleton Dragonlord Kolaghan.
Let me know what you think!