Black Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from white (This creature can't be blocked, targeted, dealt damage, or enchanted by anything white.)

Howl from Beyond

Target creature gets +X/+0 until end of turn.

Obsianus Golem

Swamp

Nightmare

Whenever this creature attacks or blocks, each opponent exiles the top two cards of their library.

Scathe Zombies

Terror

Destroy target nonartifact, nonblack creature. It can't be regenerated.

Drudge Skeletons

{B}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Frozen Shade

{B}: This creature gets +1/+1 until end of turn.

Lost Soul

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Fear

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature has fear. (It can't be blocked except by artifact creatures and/or black creatures.)

Bad Moon

El-Hajjâj

Whenever this creature deals damage, you gain that much life.

Marsh Gas

All creatures get -2/-0 until end of turn.

Flying Carpet

{2}, {T}: Target creature gains flying until end of turn.

Spirit Shackle

Enchant creature
Whenever enchanted creature becomes tapped, put a -0/-2 counter on it.