chirz2792 Deckling

Just so you know, looking at your maybeboard and Grand Arbiter Augustin IV, Mirrorweave, Vexing Shusher aren't legal because they're outside of your commander's color identity. Vorinclex, Voice of Hunger, Consecrated Sphinx, and Genesis Wave might be fun though.

Carrion Feeder and Yahenni, Undying Partisan are both good sac outlets. Also Sadistic Hypnotist can be brutal. Purphoros, God of the Forge is always dangerous with a commander who makes tokens.

@GoldenDiggle: Silumgar, the Drifting Death and Dragonlord Silumgar aren't legal in this deck. Other than that those are all great suggestions.

I would take out like Dictate of Erebos, Doubling Season, Second Harvest, and Parallel Lives. These cards work best in decks that are actively trying to abuse them and you're deck doesn't really have enough ways to take advantage of them. You could replace them with stuff that lets you get cards back like Eternal Witness, Regrowth, and Noxious Revival.

As for your manabase I would suggest replacing the guild gates and the ravnica bounce lands with basics and then running stuff like Cultivate, Rampant Growth, Farseek, Nature's Lore, and Harrow. The thing about dragons is they typically have a high cmc and ramping helps you cast them quicker. I would also up your land count to at least 36.