If I'm seeing this right, you're trying to get Deathbonnet Sprout  ^Flip transformed quickly, and Heirloom Mirror  ^Flip is the primary way to do that. Once that's done, you want to use Orcus, Prince of Undeath to bring back the low-cost creatures that flipped Sprout.

Dredge cards, like Greater Mossdog, can fill your graveyard quickly with discard and draw effects like Insolent Neonate or Faithless Looting.

Potential sequence:

T1 Deathbonnet Sprout, T2 Insolent Neonate, sacrifice Neonate and discard Greater Mossdog, then dredge Mossdog back to your hand instead of drawing. You now have five cards in your graveyard, so if you have a high enough concentration of creatures, there's a good chance you can transform Sprout on turn 2.

I would also consider some mana creatures: Wild Cantor, Llanowar Elves, or Elves of Deep Shadow for some thoughts.

I like the idea. A problem I see is that you kind of want to be a fast deck, but the shroom alone will propably not be enough aggression to "be the aggro".

Another card that's great for such decks is Vessel of Nascency. It's similar to Heirloom Mirror  ^Flip and can also help in case you want to include some Delirium cards. As legendofa said, Dredge is very fitting. You could also consider Splinterfright and Nyx Weaver.

Some thoughts:

• your build-around creatures of Deathbonnet Sprout  ^Flip and Heirloom Mirror  ^Flip are both incredibly slow cards to get running, so I think you want to be aiming this deck to be something more midrange-orientated than aggro (as a lot of decks will outspeed this interaction). Luckily you're in the right colour-pair for a very interactive and midrange style deck (more on suggestions around this below).

• Both Jadelight Ranger and Merfolk Branchwalker seem like really bad options here, as they don't particularly help enable anything you're doing. Some better options could be as so: Eternal Scourge feels strong here in that your build-around creatures can exile it, but then it can still be cast, and the process can be repeated, helping you in long grindy matchups. Creatures like Demon's Disciple, Fleshbag Marauder, Abyssal Gatekeeper and Plaguecrafter all seem useful too, for both providing needed interaction to slow down the opponent, while also filling your graveyard with their juicy corpses ready for consumption.

• I would really, strongly, suggest against you trying to run Orcus, Prince of Undeath in this deck. Him being red is going to push you into three colours, and trying to build a 3-colour deck on a budget while still having it function isn't easy. Secondly, it just demands an insane quantity of mana. For 5 mana he'll get you back a single 1cmc creature... that's pretty lame - without dedicated ramp he's just not going to perform well. I think you have a better chance of making something viable by keeping your plan simple, and that means ditching this guy.

• I think Call of the Death-Dweller is a decent card to include in the deck, but don't bother with Gruesome Menagerie. It's a LOT of mana and is probably going to cause more deck building restrictions than actually help you out.

Just brainstorming here, but something like the below feels viable to me. Your meta and/or tastes may vary (the list I've built here is with Modern-legality in mind, just because that's the format I know best. Also tried to stay with budget cards) It centralizes around the Sprout and Mirror, but also abuses creature sacrifice with Glissa to accelerate your gameplan, and get Mirrors back if needed:

• 4x Deathbonnet Sprout  ^Flip
• 4x Heirloom Mirror  ^Flip
• 4x Plaguecrafter
• 4x Demon's Disciple
• 3x Eternal Scourge
• 3x Stinkweed Imp
• 4x Glissa, the Traitor
• 3x Infernal Grasp
• 3x Unearth
• 3x Nihil Spellbomb
• 3x Chromatic Star
• 22x Lands

I know you went for jund and I am not sure what level of play you're aiming for, but Rakshasa Vizier could be a fun card with exiling if you target your own graveyard. I would like to second the recommendation of Splinterfright.

wallisface I really love your deck list im probably gonna build it, but im not really sure about Glissa, the Traitor its a 3 mana 3/3 that can come back with Unearth is blocker that will make my opponents afraid of attacking because of the deathtouch, but i think i would like a card that brings something back other than Heirloom Mirror  ^Flip, there might be situations were i could need another creature or maybe even an Unearth on hand or an Infernal Grasp.

what do u think?

Ascarmillion I think if you’re really wanting more recursion, swap out the Eternal Scourge for Eternal Witness. However I don’t think you would want anything more than that - there’s not really any cards that need to be in play for the deck to function, so investing too much on recursion probably isn’t the best strategy.

Also, in the list I wrote, Glissa, the Traitor can also bring back Nihil Spellbomb and Chromatic Star, which gives you some pretty decent card draw

wallisface damn you are right, it flew completly over my head that it could bring back Nihil Spellbomb and Chromatic Star, its actually dope ahah, thanks a lot, i will definitly build this.