https://moxfield.com/decks/SRQHdjXQwUWwX20gGkDtsw
looking for help refining this, feel like i have it in a decent position, think it just needs a little bit of extra oomph
#rendmaw dual card types matter
granite junco
plain maple
I would swap ornithopter and the creature that makes your lands basic out for something else, ornithopter is a dead card without the commander and probably not worth a full card with the commander in play imo, and basic isn't a type counted by the commander, and i don't see any other combos with it
Culling ritual also seems strange, it kills all the progress made on crows to make a lot of mana, but i don't see many obvious mana sinks for it
[[triarch stalker]] could be a good card, useful by itself, activates the commander and potentially gives birds menace
spiral parrotBOT
plain maple
[[beastmaster ascension]] instead of [[banner of kinship]]? It still mostly relies on birds being out, but buffs all your other creatures and is buffed by other creatures as well. Unless you find your board often has 6+ birds it serms better
plain maple
You are also running imo way too much ramp(24 cards if i counted right) and way too few lands, the only thing a rampant growth is doing if you don't draw a third land by third turn is making your land drop cost 2 mana.
I like effects like [[viconia, drow]] and [[oversold cemetery]] to not run out of gas
plain maple
[[refurbrished familiar]] seems like a good card to run
[[Skyscanner]] and maybe [[scrapwork rager]] as well
spiral parrotBOT
Artifact Creature — Zombie Rat
Affinity for artifacts (This spell costs 
less to cast for each artifact you control.)
Flying
When this creature enters, each opponent discards a card. For each opponent who can't, you draw a card.
When her beloved pet died, the artificer turned to necromancy.
2/1
Artifact Creature — Phyrexian Horror
When this creature enters, you draw a card and you lose 1 life.
Unearth 
(: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)
2/2
plain maple
[[Erebos, bleak]] and [[sadistic hypnotist]] as well
spiral parrotBOT
Legendary Enchantment Creature — God
Indestructible
As long as your devotion to black is less than five, Erebos isn't a creature.
Whenever another creature you control dies, you may pay 2 life. If you do, draw a card.
, Sacrifice another creature: Target creature gets -2/-1 until end of turn.
5/6