hey all im planning on making my first 5 color commander deck and want it to be scion. im planning on making it a cheaper deck at first and then progressively make it better and more expensive and was wanting some help as to what i should get to start the deck off. i still want to make it a dragon deck and not just a 5 color toolbox deck. any and all help is extremely appreciated!

Living Death! Definitely get this one.
Numot, the Devastator
Nicol Bolas (not planeswalker)
roughly $7 for the 3

When I think dragons in EDH Scourge of the Throne, Hellkite Tyrant and Utvara Hellkite always come to mind. Maybe Bladewing the Risen and Dragon Arch?

You'll definitely want Dragonstorm (about $1) and Scourge of Valkas ($1.75)

Also there's a number of cards that make dragon tokens - Day of the Dragons, Broodmate Dragon, Dragon Roost to name a few. & If you're using them, you'll want the token doubling enchantments too.

don't forget to fill it mana rocks and mana dorks also the new Tarkir Dragons will crank it up another notch

Death by dragons makes everybody (but one person) happy!