Flying

At the beginning of each opponent's end step, that player chooses up to two creatures they control, then sacrifices the rest.

Flying

Whenever you cycle or discard another card, put a -1/-1 counter on each creature your opponents control.

Cycling (, Discard this card: Draw a card.)

Flying

Whenever a source an opponent controls deals damage to Archfiend of Spite, that source's controller loses that much life unless they sacrifice that many permanents.

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

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

When Archfiend's Vessel enters the battlefield, if it entered from your graveyard or you cast it from your graveyard, exile it. If you do, create a 5/5 black Demon creature token with flying.

Flying

Whenever Bellowing Fiend deals damage to a creature, Bellowing Fiend deals 3 damage to that creature's controller and 3 damage to you.

When Cackling Fiend enters the battlefield, each opponent discards a card.

Flying

Whenever Fiend of the Shadows deals combat damage to a player, that player exiles a card from their hand. You may play that card for as long as it remains exiled.

Sacrifice a Human: Regenerate Fiend of the Shadows.

Haste (This creature can attack and as soon as it comes under your control.)

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)

When Gibbering Fiend enters the battlefield, it deals 1 damage to each opponent.

Delirium — At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, Gibbering Fiend deals 1 damage to that player.

Haste

Goblin Fire Fiend must be blocked if able.

: Goblin Fire Fiend gets +1/+0 until end of turn.

: Target creature attacks this turn if able.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

, Sacrifice another creature: Put a +1/+1 counter on Hobblefiend.

Whenever you cast an instant or sorcery spell, Kiln Fiend gets +3/+0 until end of turn.

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.)

: 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.

Devour 2 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with twice that many +1/+1 counters on it.)

When Tar Fiend enters the battlefield, target player discards a card for each creature it devoured.

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.