Tibalt, Wicked Tormentor

[+1]: Add {R}{R}. Draft a card from Tibalt, Wicked Tormentor's spellbook, then exile it. Until end of turn, you may cast that card.
[+1]: Tibalt, Wicked Tormentor deals 4 damage to target creature or planeswalker unless its controller has Tibalt deal 4 damage to them. If they do, you may discard a card. If you do, draw a card.
[−X]: Create X 1/1 red Devil creature tokens with "When this creature dies, it deals 1 damage to any target."

Alchemy: Innistrad

+1: Add {R}{R}. Draft a card from Tibalt, Wicked Tormentor's spellbook, then exile it. Until end of turn, you may cast that card.
+1: Tibalt, Wicked Tormentor deals 3 damage to target creature or planeswalker unless its controller has Tibalt deal 3 damage to them. If they do, you may discard a card. If you do, draw a card.
−X: Create X 1/1 red Devil creature tokens with "When this creature dies, it deals 1 damage to any target."

Charmbreaker Devils

At the beginning of your upkeep, return an instant or sorcery card at random from your graveyard to your hand.
Whenever you cast an instant or sorcery spell, Charmbreaker Devils gets +4/+0 until end of turn.

To the Rakdos, screams of delight and screams of terror are one and the same.

Havoc Jester

Whenever you sacrifice a permanent, Havoc Jester deals 1 damage to any target.

The devil appreciated the irony of using doves for ammunition. The townsfolk, not so much.

Spiteful Prankster

During your turn, Spiteful Prankster has first strike.
Whenever another creature dies, Spiteful Prankster deals 1 damage to target player or planeswalker.

Devil's Play

Devil's Play deals X damage to any target.
Flashback {X}{R}{R}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Forge Devil

When Forge Devil enters the battlefield, it deals 1 damage to target creature and 1 damage to you.

When Forge Devil enters, it deals 1 damage to target creature and 1 damage to you.

Sin Prodder

Menace
At the beginning of your upkeep, reveal the top card of your library. Any opponent may have you put that card into your graveyard. If a player does, Sin Prodder deals damage to that player equal to that card's mana value. Otherwise, put that card into your hand.

Brimstone Vandal

Menace (This creature can't be blocked except by two or more creatures.)
If it's neither day nor night, it becomes day as Brimstone Vandal enters.
Whenever day becomes night or night becomes day, Brimstone Vandal deals 1 damage to each opponent.

So many candles. So many flammables. So little time.

Festival Crasher

Whenever you cast an instant or sorcery spell, Festival Crasher gets +2/+0 until end of turn.

"Devils need no reason to stir up chaos. The chaos itself is their reward."
—Rem Karolus, Fiendslayer

Frenzied Devils

Haste
Whenever you cast a noncreature spell, Frenzied Devils gets +2/+2 until end of turn.

A momentary lapse is all it needs to break free.

Chained Brute

Chained Brute doesn't untap during your untap step.
{1}, Sacrifice another creature: Untap Chained Brute. Activate only during your turn.

"Behind every devil's mayhem lurks a demon's scheme."
—Rem Karolus, Blade of the Inquisitors

Hellrider

Haste
Whenever a creature you control attacks, Hellrider deals 1 damage to the player or planeswalker it's attacking.

"Find out whose that is. I like its energy."
—Judith

Tibalt's Rager

When Tibalt's Rager dies, it deals 1 damage to any target.
{1}{R}: Tibalt's Rager gets +2/+0 until end of turn.

Torch Fiend

{R}, Sacrifice Torch Fiend: Destroy target artifact.

Bedbugs aren't the only things you need to worry about biting you at night.

Hobblefiend

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
{1}, Sacrifice another creature: Put a +1/+1 counter on Hobblefiend.

The ingenuity of goblins, the depravity of demons, and the smarts of sheep.

Pitchburn Devils

When Pitchburn Devils dies, it deals 3 damage to any target.