Looking for advice on this Gruul deck

So far this seems like my most consistent Bo3 deck. It does ok in CE enough to get my Rare rewards rather often. Can't really seem to get past Gold in Ranked though. Looking for advice on the main deck and sideboard.

Creatures (29)

• 4 Llanowar Elves
• 2 Paradise Druid
• 2 Kraul Harpooner
• 4 Zhur-Taa Goblin
• 4 Gruul Spellbreaker
• 3 Rekindling Phoenix
• 4 Nullhide Ferox
• 2 Ilharg, the Raze-Boar
• 2 Skaargan Hellkite
• 1 God-Eternal Rhonas
• 1 Carnage Tyrant

Noncreatures (7)

• 2 Domri's Ambush
• 1 Thrash//Threat
• 2 Vivien's Arkbow
• 2 Domri, Anarch of Bolas

Lands (24)

• 4 Stomping Ground
• 4 Rootbound Crag
• 8 Forest
• 8 Mountain

Sideboard

• 2 Shock (against fast aggro decks I tend to take out the Arkbow because it's slow and put these in)
• 1 Kraul Harpooner (can take out a Goblin against flier-heavy decks)
• 1 Vivien's Arkbow (for against control so I can keep pulling threats)
• 3 Cindervines (Bolas Citadel, control, Nexus Reclamation, stuff like that)
• 3 Collision//Collosus (deals with just about any flier, also a combat trick
• 1 Vine Mare (pretty much just to take out a Nullhide Ferox if I add in more non-creatures
• 1 Biogenic Ooze (same thing as above, I guess)
• 1 Carnage Tyrant (against control, can take out one of my other late-game threats for another one these "fuck control" dinos)
• 2 Banefire (for any deck with a slow-ass win con, at least I can hope that if I draw this I can finish them off guaranteed)

Any and all tips about the main deck or sideboard are appreciated. It is a pretty versatile deck but I might have questionable choices here and there.