This deck is meant to be a focused deck, a Dragon tribal beatdown deck, I know that the theme itself is not strong, but I want to build it as strong as it can be.
Because you want the Timmy in you bath in the joy of playing big flying beaters fast
Because your playgroup its just too competitive and plentiful of fast decks that can win at T4-6
While reading the stats please note that sometimes one single card acts as two or more effects
I priorate versatile cards so many of my cards will serve more than one purpose, thats why I will count one card as two in some cases, for example The Great Henge is considered draw and ramp
Card draw : 10
Spot removal : 3 (plus 5 conditional removals like Terror of the Peaks )
Mass removal : 1 (plus 3 conditionals like Balefire Dragon )
Mana Cheat : 3
Mana acceleration : 10 (plus 6 conditionals such as Zendikar Resurgent )
Tutors : 2
Protection : 3
Removing some stuff
We have a lot of things going on on our table and we have really not many spots for interaction with our opponent's plan, for that case I value flexible removal but strong effects such as Path to Exile : Because is cheap and exiles Utter End : Because is the more flexible removal (to be replaced for Anguished Unmaking ) Boros Charm : I will use this as removal only as a very last resort, I have it here mostly for indestructibility
Not sure if you're looking for suggestions, if not disregard. I've never really been a big fan of any of the Dragonlord cycle, excluding Dragonlord Dromoka for it's Grand Abolisher-eske control implications. DL Atarka isn't that great for removal purposes in my list I run Warstorm Surge which can end games with some of the other Dragonstaples, and it is cheaper. I guess DL Kolaghan is meta specific, but I never saw the appeal personally. Your Dragon Tempest fulfills that haste enabling well, and as a damage outlet.
I am not a fan also of Palladia-Mors, the Ruiner, as you well said, I probably will be replacing it for Dromoka, every other of your suggestions are also great, I love Mirage Mirror, Garruk's Uprising, and Warstorm Surge, The problem I have right now is basically that I am unsure on what to cut for those in, DL Atarka is a posible 1 spot free, but then.. I still need more spots