CGB built a version of this deck and I made some tweaks to accelerate the combo. Especially
Hunt for Specimens has been really slow and I've never been happy to play it. It's inefficient by itself and makes up for it by fetching an inefficient lesson. I rarely won a game when this was my only turn 2 play. Another card I cut was
Valentin, Dean of the Vein. It has never been more than sac fodder with a lot of text and
Lisette, Dean of the Root is once again too slow and clunky. It doesn't even synergize that well with the deck, because sacrificing is usually better than swinging anyway.
Deck
4 x
Eyetwitch4 x
Gilded Goose4 x
Lovestruck Beast4 x
Village Rites4 x
Witherbloom Apprentice2 x
Dina, Soul Steeper4 x
Plumb the Forbidden2 x
Tend the Pests4 x
Sedgemoor Witch4 x
Bastion of Remembrance1 x
Vito, Thorn of the Dusk Rose10 x
Swamp9 x
Forest4 x
Darkbore PathwayCompanion
1 x
Jegantha, the WellspringSideboard
3 x
Pest Summoning2 x
Necrotic Fumes1 x
Containment BreachThe most notable addition is
Gilded Goose. It doesn't look impressive, but one more mana is a big deal, if all your combo enablers are CMC 2-3. With a turn 1 goose, you can play the important pieces much more reliable on turns 2-4 and dodge getting stomped by
Bonecrusher Giant with a
Bastion of Remembrance on turn 2. Later on, it's just as good as any other 1-drop as sacrifice fodder.
Dina, Soul Steeper and
Vito, Thorn of the Dusk Rose are additional combo pieces and I've chosen the mix to avoid duplicates and have an additional wincon in Vito's activated ability.
The most controversial addition might be
Tend the Pests. Remember the
Lovestruck Beast that made a cheap token, triggered magecraft and is now sitting in exile until the end of the game, because it provides too little for your combo? Well, now it's quite useful and probably your only hope to recover from a board wipe.
Jegantha, the Wellspring serves a similar purpose.
The mana base could probably be improved with
Necroblossom Snarl. I didn't have a chance to test it, but be wary of too many tapped lands. Speed is very important here.