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I'm still thinking here.

One of my favorite turn 4 plays against Jund was oddly enough, Gravedigger to get back my gatekeeper.

Here's something else to consider:

1. Jund runs oodles of removal.
2. Jund loves removing anything you play before bloodbraid elf with a bbe cascade.
3. Don't play any permanents before turn 4.

Yes, I totally just said that. A turn 2 sign in blood is fine. But playing a 3rd and 4th swamp and passing leaves Jund clueless. Then BBE into terminate/pulse/bolt is a joke on 4. You can just tendrils something (i recommend thrinax if its being used in extended builds, or leech) then untap and kick casualties or mind sludge ftw. From there you need a ridiculously fast clock.

Also, your fae game will suffer with no instant speed removal on the cheap (doom blade, gftt, unmake). Badly. Tendrils doesn't let you beat the clique-walk and present a threat on 4.

Bloodghast is presentable and something to smash into Bitterblossom.

I'm not sure I can make a MB deck to fight faeries AND Jund equally well. The things you want against Fae become awkward as hell against Jund.

Universally good cards for these two matchups:
Unmake
Go for the Throat
Bloodghast (ok vs Jund)
Thoughtseize
Marsh Casualties (try it, you'll be surprised)
Fulminator Mage
Stillmoon Cavalier good vs. Fae, not bad vs. Jund until they hit a bolt.

At this point I could see you going a few different ways. You need some CA and that will dictate final construction. Eyeballing the above list you've got low cmc, so Tutelage might be an option. Conversely you could say no to Tutelage and add tendrils, corrupt, and sludge.

Regarding my point of cards good vs. Fae becoming bad vs. Jund... that's things like Black Knight and other bodies that are problematic for fae that prevent bitterblossom from buying you CA.

I also had a deck that had an unfairly good matchup against Fae in block that might be tweakable to fight Jund a little:

4 x Festercreep
4 x Dusk Urchins
4 x Soul Snuffers
3 x Deity of Scars

4 x Scarscale Ritual
3 x Eyeblight's Ending
3 x Corrupt
3 x Profane Command
2 x Incremental Blight


Those were some of the core cards.

You could flip Festercreep for marsh casualties.... scarscale for sign in blood, eyeblight's for go for the throat..  corrupt needs to come out completely... and blight was ok. Could go with BSZ.

Overall I don't know, but I know what I'm saying which is a gate-like token sac engine is going to be a joke to fae with tokens and jund... which has k-finks and other things that are churning up ca with man-lands to push.