You want less cards? I'm looking for a way to fit Squee in as the only never-ending supply fountain for
Charnel Troll edit: He should even "die" to the Legendary rule
We can't splash for his double red obviously. So..
Chromatic Lantern or something like that.. but probably not possible.
I'm afraid that you need to make a clear cut between "fun recycling engine" and "standard-viable power level". I have no idea, whether that 4-card-combo from my previous post that lets you turn 3 mana into a Bat and a Zombie without spending a card, is a competitive move or just some fun durdling.
And if we want that engine, we might want to be "draw go" and do all that during the opponent's turn - after potentially countering dangerous stuff, so Sultai deck. And our next Dominaria favorite:
Tatyova, Benthic Druid.
So with all that said, if it were my deck, I would probably start from scratch, try the Sultai idea and end up with a worse deck
Start with those 4 combo-pieces, add Tatyova, Vraska, Midnight Reaper because super-value
Fill with removal, counters because opponents will have bigger stuff than 1/1 Bats
Craft 8 Golgari, 8 Dimir and 4 Simic rare lands.. (at which point I have to give up
)
Not much Undergrowth left in that approach..
edit: Another card-combo you could add for your Omnivore are
Declare Dominance and
Status // StatueThis can win you the game in two ways:
1) Wipe everything with your Omnivore.
2) Turn one of your Zombies into
Taunting Elf and swing unopposed with the Omnivore.
Oh and where is
Plaguecrafter in your list?