DBC Death by Combo Tendrils

After trying to build a dragon deck unsuccessfully, (I lost to a kid who played an elf deck and naturalized my animate dead) I gave up and built a list similar to K.I.T.T. Tendrils

After playing it a few times I think the decks not too bad however my meta is rather underdeveloped. It seems much more consistent and fast compared to the dragon builds I tried, and can win turn 1, more often turn 2 or 3. sometimes later. There are two issues that I think would make this deck much better adding land grant and bayou or overgrown tomb but I know bayou would be much better. Or adding Cruel Bargain I'm leaning towards bargain more than bayou, I can't afford both at the moment.

The decklist goes as follows

land

8 swamp
3 cabal pit

Mana accel

4 dark ritual
4 cabal ritual
4 culling the weak
1 Mana Crypt
1 Mox Diamond
1 Chrome Mox
1 Mana Vault
1 Grim Monolith
1 Lion's eye diamond
1 sol ring
1 Lotus Petal

Disrupt
4 Cabal Therapy

Draw

1 Memory Jar
1 Necropotence
1 Yawgmoth's Bargain
4 Infernal Contract

Tutor
1 Demonic Consultation
1 Vampiric Tutor
1 Demonic Tutor
2 Demonic Intent

Sac Critters
2 Ornithopter
4 Phyrexian Walker
2 Shield Sphere

Bringing Back the yard
1 Yawgmoth's Will
1 Ill-Gotten Gains

Kill
3 Tendrils of Agony

Majorly Underdeveloped Transformational Suicide Black Sideboard

4 Drinker of Sorrow
4 Yixlid Jailor
4 Rathi Trapper
3 Snuff Out

The good news is that elf deck never beats me anymore, neither does a goblin or affinity, there is a MUC deck that sometimes gives me trouble though. Turn 1 cabal therapy naming force of will and following will an ornithopter to sac and play therapy again to tear his hand apart helps.

A couple explanations for card choices.

I also use cabal pit to help deal with those pesky creatures.

3 tendrils is because the deck is underdeveloped I tried 2 but seemed to fizzle more often than 3.

1 Iggy helps with the stalling problem to pick up rituals and tutors or infernal contracts out of the yard.

Could a list like this become somewhat viable? (this list is no proxy so I could proxy up some for proxy tournaments)

In short I think this is a good deck(easily the best combo deck I've ever played) Should I get Cruel Bargains or Bayou's I'd like bargain's because the deck occasionally stalls and I think switching out some cards for Bargains would help that. Also I'd like to splash green to deal with stuff like leyline of the void.

What might be a good sideboard that I use while still trying to combo off, I have snuff out to deal with some pesky creatures but other than that the sideboard is terrible.