Nekrataal

First strike
When Nekrataal enters, destroy target nonartifact, nonblack creature. That creature can’t be regenerated.

Pernicious Deed

, Sacrifice Pernicious Deed: Destroy each artifact, creature, and enchantment with mana value X or less.

Goblin Lackey

Whenever Goblin Lackey deals damage to a player, you may put a Goblin permanent card from your hand onto the battlefield.

Chain Lightning

Chain Lightning deals 3 damage to any target. Then that player or that permanent’s controller may pay . If the player does, they may copy this spell and may choose a new target for that copy.

Mindbreak Trap

If an opponent cast three or more spells this turn, you may pay rather than pay this spell’s mana cost.
Exile any number of target spells.

Samurai of the Pale Curtain

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
If a permanent would be put into a graveyard, exile it instead.

Patagia Viper

Flying
When Patagia Viper enters, create two 1/1 green and blue Snake creature tokens.
When Patagia Viper enters, sacrifice it unless was spent to cast it.

Seal of Fire

Sacrifice Seal of Fire: It deals 2 damage to any target.

Boldwyr Intimidator

Cowards can’t block Warriors.
: Target creature becomes a Coward until end of turn.
: Target creature becomes a Warrior until end of turn.

Aven Fisher

Flying (This creature can’t be blocked except by creatures with flying or reach.)
When Aven Fisher dies, you may draw a card.

Seal of Removal

Sacrifice Seal of Removal: Return target creature to its owner’s hand.

Ramosian Rally

If you control a Plains, you may tap an untapped creature you control rather than pay this spell’s mana cost.
Creatures you control get +1/+1 until end of turn.

Shelter

Target creature you control gains protection from the color of your choice until end of turn.
Draw a card.

Trostani’s Judgment

Exile target creature, then populate. (Create a token that’s a copy of a creature token you control.)

Supernatural Stamina

Until end of turn, target creature gets +2/+0 and gains “When this creature dies, return it to the battlefield tapped under its owner’s control.”

Reclamation Sage

When this creature enters, you may destroy target artifact or enchantment.

Crawling Sensation

At the beginning of your upkeep, you may mill two cards. (You may put the top two cards of your library into your graveyard.)
Whenever one or more land cards are put into your graveyard from anywhere for the first time each turn, create a 1/1 green Insect creature token.

Seller of Songbirds

When Seller of Songbirds enters, create a 1/1 white Bird creature token with flying.

Seal of Cleansing

Sacrifice Seal of Cleansing: Destroy target artifact or enchantment.

Snake Umbra

Enchant creature
Enchanted creature gets +1/+1 and has “Whenever this creature deals damage to an opponent, you may draw a card.”
Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)