Ruham Djinn

First strike
Ruham Djinn gets -2/-2 as long as white is the most common color among all permanents or is tied for most common.

Death or Glory

Separate all creature cards in your graveyard into two piles. Exile the pile of an opponent’s choice and return the other to the battlefield.

Sengir Vampire

Flying (This creature can’t be blocked except by creatures with flying or reach.)
Whenever a creature dealt damage by Sengir Vampire this turn dies, put a +1/+1 counter on Sengir Vampire.

Thresher Beast

Whenever Thresher Beast becomes blocked, defending player sacrifices a land.

Conspiracy

As Conspiracy enters the battlefield, choose a creature type.
Creatures you control are the chosen type. The same is true for creature spells you control and creature cards you own that aren’t on the battlefield.

Midnight Ritual

Exile X target creature cards from your graveyard. For each creature card exiled this way, create a 2/2 black Zombie creature token.

Undertaker

, , Discard a card: Return target creature card from your graveyard to your hand.

Sever Soul

Destroy target nonblack creature. It can’t be regenerated. You gain life equal to its toughness.

Black Market

Whenever a creature dies, put a charge counter on Black Market.
At the beginning of your precombat main phase, add for each charge counter on Black Market.

Maggot Therapy

Flash
Enchant creature
Enchanted creature gets +2/-2.