Rush of Adrenaline

Target creature gets +2/+1 and gains trample until end of turn.

Dance with Devils

Create two 1/1 red Devil creature tokens. They have "When this creature dies, it deals 1 damage to any target."

Inner Struggle

Target creature deals damage to itself equal to its power.

Lightning Axe

As an additional cost to cast this spell, discard a card or pay {5}.
Lightning Axe deals 5 damage to target creature.

Magmatic Chasm

Creatures without flying can't block this turn.

Murderer's Axe

Equipped creature gets +2/+2.
Equip—Discard a card.

Devilthorn Fox

Angelic Purge

As an additional cost to cast this spell, sacrifice a permanent.
Exile target artifact, creature, or enchantment.

Unruly Mob

Whenever another creature you control dies, put a +1/+1 counter on Unruly Mob.

Plains

Devils' Playground

Create four 1/1 red Devil creature tokens. They have "When this creature dies, it deals 1 damage to any target."

Inspiring Captain

When Inspiring Captain enters, creatures you control get +1/+1 until end of turn.

Stern Constable

{T}, Discard a card: Tap target creature.

Howlpack Wolf

Howlpack Wolf can't block unless you control another Wolf or Werewolf.

Mountain

Pyre Hound

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

Dissension in the Ranks

Target blocking creature fights another target blocking creature.

Ember-Eye Wolf

Haste
{1}{R}: Ember-Eye Wolf gets +2/+0 until end of turn.

Allied Reinforcements

Create two 2/2 white Knight Ally creature tokens.

Runaway Carriage

Trample
When Runaway Carriage attacks or blocks, sacrifice it at end of combat.

Cathar's Companion

Whenever you cast a noncreature spell, Cathar's Companion gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Nahiri's Machinations

At the beginning of combat on your turn, target creature you control gains indestructible until end of turn.
{1}{R}: Nahiri's Machinations deals 1 damage to target blocking creature.

Gryff's Boon

Enchant creature
Enchanted creature gets +1/+0 and has flying.
{3}{W}: Return Gryff's Boon from your graveyard to the battlefield attached to target creature. Activate only as a sorcery.