Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

At the beginning of your upkeep, you may move a +1/+1 counter from target creature onto Arcbound Fiend.

Modular 3 (This creature enters the battlefield with three +1/+1 counters on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Flying

Your opponents can't gain life.

At the beginning of each end step, each opponent loses life equal to the life that player lost this turn. (Damage causes loss of life.)

Flying

When Archfiend of Sorrows enters the battlefield, creatures your opponents control get -2/-2 until end of turn.

Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Flying

Archfiend of the Dross enters the battlefield with four oil counters on it.

At the beginning of your upkeep, remove an oil counter from Archfiend of the Dross. Then if it has no oil counters on it, you lose the game.

Whenever a creature an opponent controls dies, its controller loses 2 life.

Binding Contract — If you would draw a card, exile the top card of your library face down instead.

: Draw seven cards.

: Return all cards exiled with Asmodeus the Archfiend to their owner's hand and you lose that much life.

When Bogardan Firefiend dies, it deals 2 damage to target creature.

Haste

Daring Fiendbonder attacks each combat if able.

, Exile Daring Fiendbonder from your graveyard: Put an indestructible counter on target creature. Activate only as a sorcery.

Fiend Artisan gets +1/+1 for each creature card in your graveyard.

, , Sacrifice another creature: Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery.

When Fiend Hunter enters the battlefield, you may exile another target creature.

When Fiend Hunter leaves the battlefield, return the exiled card to the battlefield under its owner's control.

First strike

If a source would deal damage to an opponent, it deals double that damage to that player instead.

First strike (This creature deals combat damage before creatures without first strike.)

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Fiendslayer Paladin can't be the target of black or red spells your opponents control.

When Footlight Fiend dies, it deals 1 damage to any target.

Flying

Whenever another artifact enters the battlefield under your control, Glaze Fiend gets +2/+2 until end of turn.

As an additional cost to cast this spell, you may sacrifice a non-Demon creature.

Flying

When Graven Archfiend enters the battlefield, if its additional cost was paid, conjure a card named Demonic Pact onto the battlefield.

Haste

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

: Henchfiend of Ukor gets +1/+0 until end of turn.

Flying

: Exile target creature card from a graveyard. Put a +1/+1 counter on Inherited Fiend.

When Kuldotha Flamefiend enters the battlefield, you may sacrifice an artifact. If you do, Kuldotha Flamefiend deals 4 damage divided as you choose among any number of targets.

When Mesmeric Fiend enters the battlefield, target opponent reveals their hand and you choose a nonland card from it. Exile that card.

When Mesmeric Fiend leaves the battlefield, return the exiled card to its owner's hand.

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

Mycosynth Fiend gets +1/+1 for each poison counter your opponents have.

: Phantasmal Fiend gets +1/-1 until end of turn.

: Switch Phantasmal Fiend's power and toughness until end of turn.

Flying

Other Demons, Devils, Imps, and Tieflings you control get +1/+1 and have lifelink.

At the beginning of each end step, if a creature card was put into your graveyard from anywhere this turn, create a 1/1 red Devil creature token with "When this creature dies, it deals 1 damage to any target."

When Shadowgrange Archfiend enters the battlefield, each opponent sacrifices a creature with the greatest power among creatures they control. You gain life equal to the greatest power among creatures sacrificed this way.

Madness—, Pay 8 life. (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

When Soulcage Fiend dies, each player loses 3 life.

Whenever Stubborn Burrowfiend becomes saddled for the first time each turn, mill two cards, then Stubborn Burrowfiend gets +X/+X until end of turn, where X is the number of creature cards in your graveyard.

Saddle 2 (Tap any number of other creatures you control with total power 2 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

Tectonic Fiend attacks each combat if able.

Remove Timmerian Fiends from your deck before playing if you're not playing for ante.

, Sacrifice Timmerian Fiends: The owner of target artifact may ante the top card of their library. If that player doesn't, exchange ownership of that artifact and Timmerian Fiends. Put the artifact card into your graveyard and Timmerian Fiends from anywhere into that player's graveyard. This change in ownership is permanent.

At the beginning of your end step, you lose 1 life.