So i plan on playing 5 color dragons, looks like its gonna be great
I'd say it would be more like a 4/5 color red green deck because both colors have great dragons, red has the goblin that makes dragons cheaper and green can ramp dragons out
See it uses the ramp from r/g to make it into dragons like {dragonlord kolaghan} and also so you get access to {ojutai, soul of winter} and it gives the deck an overall utility
Between {Mana Confluence}, {Crucible of the Spirit Dragon} and what's the other one? It's doable. I plan on going Temur.
Edit: {Haven of the Spirit Dragon}
I am planing {R}{G}{B}{U}. Dramoka and ojutai dont seem as prevalent. R and G are must haves. I like black for the new dragon that gives then haste and for removal. Blue for {sarhken unbroken} and {stubborn denial}.
Wardscale would be nice but i am leery of going 5 color. I might though for it and {pacifism}