I run a Jund dredgevine build myself (My Dredgeshake Brings All the Demigods To the Yard). I run a playset of Demigod of Revenge in mine, but I also run Bloodsoaked Champion. It's a one-drop that has recursibility. I like it.

Also Bloodghast > Gravecrawler. 'Crawler's ability is just too conditional if you're not running any other zombies.

Things to consider:

3 dredge cards is a little bit too litle. I would find room for 3 Golgari Grave-Troll for sure.

Bring 1 gnaw main, the deck tends to do a lot of damage to itself.

Run at least 7 fetches. You can skimp on fetch targets. 7 fetches, 6 duals (4 overgrown tomb for sure) and 3 basics are good enough to support your needs.

Tasigur does nothing in a dredge deck. Gurmag Angler also has a blank text box, but a better body.

If you ever want to activate the ability of Vengevine, run 4 Gravecrawler. Otherwise, you are not bringing those bad boys back.

Here is my list for reference:

Recursion theory - Vengevine edition

Boza this is a dredge deck without dredge... I mean I can feed my graveyard with does card Grisly Salvage, Satyr Wayfinder, Faithless Looting.

I may change Satyr Wayfinder for Stinkweed Imp for more recursive dredge. And I will give a try to Vexing Devil but if it turns out to be a bad 1 drop I will bring back Gravecrawler

Sure you can do without dredge but it is highly ineffective.

The reason dredge is used in these types of decks is because it functions very efficiently in achieving the end goal. Example: Stinkweed imp requires simply to be in the graveyard (much easier requirement for this type of deck than the hand) and 0 mana and results in 5 cards milled.

Faithless looting is 1 mana, costs a card in your hand and mills only two cards. The only reason Faithless is in the deck usually is that you can replace both draws with dredges, resulting in 12 cards in the yard and the discarding of the original dredgers.

Satyr wayfinder is 2 mana for 3 to 4 cards in the yard and 1/1 body in a deck that operates on 2-3 mana well.

Grisly Salvage is 2 mana for 4 to 5 cards in the yard, though instant speed helps. It being the only instant does not help, so you cannot bluff anything, but hey, it is there to fill out the slots mostly.

Read carefully the text on vengevine, you need to actually cast 2 creatures in order to bring it back. So bloodghast does nothing, other vengevines do nothing and you will very quickly run out of creatures to cast from your hand. gravecrawlers are a must.