The more I think about it, the more I feel this card is definitely deserving of a $30 pricetag.
You can try to find them for ~$20 now, but in a month, this card is going to be $30. I'm just calling it right now.
However, as I keep thinking, I still can't see how to fit this in Jund. What would the list look like? I just can't picture it -- the spells in Jund are so powerful, there's no room for a 4/3 Haste that you can't ever get back from the GY unless the stars align. (A lot of the time you cascade into a spell. Not a creature. And casting two creatures in one turn rarely happens. Holding BACK a creature to wait for an opportunity is also a terrible idea.) But here's ... a start?
4 Putrid Leech
4 Jund Hackblade
4 Sprouting Thrinax
2 Borderland Ranger
4 Bloodbraid Elf
4 Vengevine
4 Siege-Gang Commander
4 Lightning Bolt
4 Blightning
Looks pretty bad. But I feel like to enable Vengevine you need another 2-drop.
Another direction is the 4-color Ancient Ziggy version of Jund that plays Birds of Paradise and... sometimes Lotus Cobra. That makes more sense actually.
4 Birds of Paradise
4 Lotus Cobra
4 Sedraxis Specter
4 Sprouting Thrinax
4 Bloodbraid Elf
4 Vengevine
2 Siege-Gang Commander
4 Lightning Bolt
4 Blightning
Anyway these are some very rough lists right here. And I don't LIKE them, but if you try to fit Vengevine into a regular Jund frame, I feel like you get a 4/3 haste that will occasionally come back - but not usually when you want it to.
If you want to maximize Vengevine, just play Naya or maybe even GW. That's my advice. I still think it's going to go to $30 because it's nuts in the right deck. And people are going to try to put them in a Jund frame anyway. No matter what I think of the issue.
On the other end of the spectrum, people are ALSO going to be playing more Persecutors (because there's a lot of good sac outlets right now.) Expect Persecutors to go up in price in the next month.
