Bone Splinters

As an additional cost to cast this spell, sacrifice a creature.
Destroy target creature.

Tar Snare

Target creature gets -3/-2 until end of turn.

Outnumber

Outnumber deals damage to target creature equal to the number of creatures you control.

Demon's Grasp

Target creature gets -5/-5 until end of turn.

Blighted Gorge

{T}: Add {C}.
{4}{R}, {T}, Sacrifice Blighted Gorge: It deals 2 damage to any target.

Valakut Invoker

{8}: Valakut Invoker deals 3 damage to any target.

Nightmare

Flying (This creature can't be blocked except by creatures with flying or reach.)
Nightmare's power and toughness are each equal to the number of Swamps you control.

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.

Lavastep Raider

{2}{R}: Lavastep Raider gets +2/+0 until end of turn.

Cinder Hellion

Trample
When Cinder Hellion enters, it deals 2 damage to target opponent or planeswalker.

Rolling Thunder

Rolling Thunder deals X damage divided as you choose among any number of targets.

Untamed Hunger

Enchant creature
Enchanted creature gets +2/+1 and has menace. (It can't be blocked except by two or more creatures.)

Rottenheart Ghoul

When Rottenheart Ghoul dies, target player discards a card.

Mountain

Devour in Flames

As an additional cost to cast this spell, return a land you control to its owner's hand.
Devour in Flames deals 5 damage to target creature or planeswalker.

Dutiful Return

Return up to two target creature cards from your graveyard to your hand.

Hagra Sharpshooter

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

Zulaport Cutthroat

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

Mind Rot

Sparkmage's Gambit

Sparkmage's Gambit deals 1 damage to each of up to two target creatures. Those creatures can't block this turn.

Pyre Hound

Trample
Whenever you cast an instant or sorcery spell, put a +1/+1 counter on Pyre Hound.

Dead Weight

Enchant creature
Enchanted creature gets -2/-2.

Vampire Noble

Stonefury

Stonefury deals damage to target creature equal to the number of lands you control.

Borderland Marauder

Whenever Borderland Marauder attacks, it gets +2/+0 until end of turn.

Walking Corpse

Shivan Dragon

Flying
{R}: This creature gets +1/+0 until end of turn.

Hulking Devil

Cone of Flame

Cone of Flame deals 1 damage to any target, 2 damage to another target, and 3 damage to a third target.

Vampire Envoy

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

Brute Strength

Target creature gets +3/+1 and gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.)

Blighted Fen

{T}: Add {C}.
{4}{B}, {T}, Sacrifice Blighted Fen: Target opponent sacrifices a creature of their choice.