Archfiend of Ifnir

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.)

Harvester of Souls

Deathtouch
Whenever another nontoken creature dies, you may draw a card.

Flametongue Kavu

When Flametongue Kavu enters the battlefield, it deals 4 damage to target creature.

Barrage Tyrant

Devoid (This card has no color.)
, Sacrifice another colorless creature: Barrage Tyrant deals damage equal to the sacrificed creature’s power to any target.

Dromoka, the Eternal

Flying
Whenever a Dragon you control attacks, bolster 2. (Choose a creature with the least toughness among creatures you control and put two +1/+1 counters on it.)

Tattered Mummy

When Tattered Mummy dies, each opponent loses 2 life.

Sandwurm Convergence

Creatures with flying can’t attack you or planeswalkers you control.
At the beginning of your end step, create a 5/5 green Wurm creature token.

Archfiend of Ifnir

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.)

Bitterblade Warrior

You may exert Bitterblade Warrior as it attacks. When you do, it gets +1/+0 and gains deathtouch until end of turn. (An exerted creature won’t untap during your next untap step.)

Sandwurm Convergence

Creatures with flying can’t attack you or planeswalkers you control.
At the beginning of your end step, create a 5/5 green Wurm creature token.

Incendiary Flow

Incendiary Flow deals 3 damage to any target. If a creature dealt damage this way would die this turn, exile it instead.

Falkenrath Noble

Flying
Whenever Falkenrath Noble or another creature dies, target player loses 1 life and you gain 1 life.

Skirsdag Cultist

, , Sacrifice a creature: Skirsdag Cultist deals 2 damage to any target.

Augur of Bolas

When Augur of Bolas enters the battlefield, look at the top three cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Skyship Plunderer

Flying
Whenever Skyship Plunderer deals combat damage to a player, for each kind of counter on target permanent or player, give that permanent or player another counter of that kind.

Monstrous Onslaught

Monstrous Onslaught deals X damage divided as you choose among any number of target creatures, where X is the greatest power among creatures you control as you cast this spell.

Gremlin Infestation

Enchant artifact
At the beginning of your end step, Gremlin Infestation deals 2 damage to enchanted artifact’s controller.
When enchanted artifact is put into a graveyard, create a 2/2 red Gremlin creature token.

Incendiary Flow

Incendiary Flow deals 3 damage to any target. If a creature dealt damage this way would die this turn, exile it instead.

Tidal Courier

When Tidal Courier enters the battlefield, reveal the top four cards of your library. Put all Merfolk cards revealed this way into your hand and the rest on the bottom of your library in any order.
: Tidal Courier gains flying until end of turn.

Sphere of Safety

Creatures can’t attack you or a planeswalker you control unless their controller pays for each of those creatures, where X is the number of enchantments you control.

Humble Defector

: Draw two cards. Target opponent gains control of Humble Defector. Activate this ability only during your turn.

Iroas, God of Victory

Indestructible
As long as your devotion to red and white is less than seven, Iroas isn’t a creature.
Creatures you control have menace.
Prevent all damage that would be dealt to attacking creatures you control.