Dragonskull Summit

This land enters tapped unless you control a Swamp or a Mountain.
{T}: Add {B} or {R}.

Brawl-Bash Ogre

Menace (This creature can't be blocked except by two or more creatures.)
Whenever this creature attacks, you may sacrifice another creature. If you do, this creature gets +2/+2 until end of turn.

Act of Treason

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. (It can attack and {T} this turn.)

Cinder Barrens

This land enters tapped.
{T}: Add {B} or {R}.

Blood Divination

As an additional cost to cast this spell, sacrifice a creature.
Draw three cards.

Gravedigger

When this creature enters, you may return target creature card from your graveyard to your hand.

Goblin Instigator

When this creature enters, create a 1/1 red Goblin creature token.

Goblin Trashmaster

Other Goblins you control get +1/+1.
Sacrifice a Goblin: Destroy target artifact.

Murder

Open the Graves

Whenever a nontoken creature you control dies, create a 2/2 black Zombie creature token.

Rekindling Phoenix

Flying
When this creature dies, create a 0/1 red Elemental creature token with "At the beginning of your upkeep, sacrifice this token and return target card named Rekindling Phoenix from your graveyard to the battlefield. It gains haste until end of turn."

Swab Goblin

Gravewaker

Flying (This creature can't be blocked except by creatures with flying or reach.)
{5}{B}{B}: Return target creature card from your graveyard to the battlefield tapped.

Shock

Doomed Dissenter

When this creature dies, create a 2/2 black Zombie creature token.

Siege-Gang Commander

When this creature enters, create three 1/1 red Goblin creature tokens.
{1}{R}, Sacrifice a Goblin: This creature deals 2 damage to any target.

Swamp

Ravenous Harpy

Flying
{1}, Sacrifice another creature: Put a +1/+1 counter on this creature.

Mountain

Reassembling Skeleton

{1}{B}: Return this card from your graveyard to the battlefield tapped.

Demon of Catastrophes

As an additional cost to cast this spell, sacrifice a creature.
Flying, trample