NOTE: All of these creatures have deathtouch. This is a direct result of the strategy that I am employing (see Deck Strategy, above).
Foulmire Knight has deathtouch and could get us some needed card draw. If we get Sheoldred, the Apocalypse onto the battlefield, this becomes a really nice ability.
Vampire of the Dire Moon has deathtouch AND lifelink. I'll take that for only .
Fynn, the Fangbearer I mean, if the whole deck is deathtouch and there are a few cards that give trample (Massive Might), why not? Poison counters are just an extra dimension to the deck.
Gifted Aetherborn is practically the anchor for this deck. It's just so good for because it has deathtouch AND lifelink while also being a 2/3 for 2. That's a lot of value for the CMC. This is the ideal target for Master's Rebuke or Bite Down because the deathtouch will kill the opponent's creature and the lifelink will still trigger! Awesome card.
Hooded Blightfang is a powerful deathtouch creature with a big butt that pings our opponent and gains us life each time we attack. Even better, we can potentially use our instants to give a creature trample when we go after a planeswalker and kill the planeswalker as long as Hooded Blightfang is on the battlefield.
Tainted Adversary is a 2/3 for 2 with deathtouch and it has a useful ability if we draw it late game. Solid card with very good stats.
Questing Beast is just a fantastic card. Haste, vigilance, and deathtouch, and it can't be chump blocked by small creatures. Very solid card. There are only 3 copies because it is legendary, but I think going to 4 copies would be fine.
Sheoldred, the Apocalypse is arguably the strongest card printed at 4 mana in black in the entire format. I would have 3 copies in the deck, but I only own 1 copy.