Nimana Sell-Sword

Whenever Nimana Sell-Sword or another Ally you control enters, you may put a +1/+1 counter on Nimana Sell-Sword.

Swamp

Flying
Whenever Vampire Envoy becomes tapped, you gain 1 life.

Cohort — {T}, Tap an untapped Ally you control: Create a tapped 2/2 black Zombie creature token.

{4}{B}: Target creature gets -1/-1 until end of turn.

Scry 2, then draw two cards. You lose 2 life.

Whenever you gain life, Nirkana Assassin gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

Mindless Null can't block unless you control a Vampire.

Bojuka Brigand can't block.
Whenever Bojuka Brigand or another Ally you control enters, you may put a +1/+1 counter on Bojuka Brigand.

Rally — Whenever Kalastria Healer or another Ally you control enters, each opponent loses 1 life and you gain 1 life.

Whenever you gain life, Kalastria Nightwatch gains flying until end of turn.

Cohort — {T}, Tap an untapped Ally you control: You draw a card and you lose 1 life.

Whenever Zulaport Cutthroat or another creature you control dies, each opponent loses 1 life and you gain 1 life.

This spell costs {3} less to cast if it targets a creature that was dealt damage this turn.
Destroy target creature. Its controller loses 2 life.

Thriving Moor enters tapped. As it enters, choose a color other than black.
{T}: Add {B} or one mana of the chosen color.