Lash of Thorns

Target creature gets +2/+1 and gains deathtouch until end of turn.

Quench

Counter target spell unless its controller pays {2}.

Contentious Plan

Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Draw a card.

Evolving Wilds

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Grotesque Demise

Exile target creature with power 3 or less.

Enter the Enigma

Target creature can't be blocked this turn.
Draw a card.

Aven Wind Mage

Flying
Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn.

Forever Young

Put any number of target creature cards from your graveyard on top of your library.
Draw a card.

Child of Night

See Beyond

Draw two cards, then shuffle a card from your hand into your library.

Divination

Typhoid Rats

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Anticipate

Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Banehound

Toxin Analysis

Target creature gains deathtouch and lifelink until end of turn. Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")

Tragic Slip

Target creature gets -1/-1 until end of turn.
Morbid — That creature gets -13/-13 until end of turn instead if a creature died this turn.

Shimmer of Possibility

Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in a random order.

Unlikely Aid

Target creature gets +2/+0 and gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Fake Your Own Death

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 and you create a Treasure token." (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Rookie Mistake

Until end of turn, target creature gets +0/+2 and another target creature gets -2/-0.

Treason of Isengard

Put up to one target instant or sorcery card from your graveyard on top of your library.
Amass Orcs 2. (To amass Orcs 2, put two +1/+1 counters on an Army you control. It's also an Orc. If you don't control an Army, create a 0/0 black Orc Army creature token first.)

Island

Relic's Roar

Until end of turn, target artifact or creature becomes a Dinosaur artifact creature with base power and toughness 4/3 in addition to its other types.

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."

Hydrosurge

Target creature gets -5/-0 until end of turn.

Crippling Chill

Tap target creature. It doesn't untap during its controller's next untap step.
Draw a card.

Mordenkainen's Polymorph

Until end of turn, target creature becomes a Dragon with base power and toughness 4/4 and gains flying. (It loses all other creature types.)

Taste of Blood

Taste of Blood deals 1 damage to target player or planeswalker and you gain 1 life.

Savor

Target creature gets -2/-2 until end of turn. Create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this token: You gain 3 life.")

Ravine Raider

Menace (This creature can't be blocked except by two or more creatures.)
{1}{B}: This creature gets +1/+1 until end of turn.

Disfigure

Target creature gets -2/-2 until end of turn.

Sorin's Thirst

Sorin's Thirst deals 2 damage to target creature and you gain 2 life.

Vedalken Blademaster

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Agate-Blade Assassin

Whenever this creature attacks, defending player loses 1 life and you gain 1 life.

Sanitarium Skeleton

{2}{B}: Return this card from your graveyard to your hand.

Maximize Altitude

Target creature gets +1/+1 and gains flying until end of turn.
Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)

Retrofitted Transmogrant

{3}{B}: Return this card from your graveyard to the battlefield tapped with two +1/+1 counters on it.

Twist Reality

Choose one —
• Counter target spell.
• Manifest dread. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)

Virulent Swipe

Target creature gets +2/+0 and gains deathtouch until end of turn.
Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Winter's Intervention

Winter's Intervention deals 2 damage to target creature. You gain 2 life.

Coat with Venom

Target creature gets +1/+2 and gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

Don't Make a Sound

Counter target spell unless its controller pays {2}. If they do, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Doom Blade

Catalog

Tome Scour

Revolutionary Rebuff

Counter target nonartifact spell unless its controller pays {2}.

Hired Blade

Flash (You may cast this spell any time you could cast an instant.)

Final Vengeance

As an additional cost to cast this spell, sacrifice a creature or enchantment.
Exile target creature.

Unsummon

Return target creature to its owner's hand.

Costly Plunder

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards.

Bladebrand

Target creature gains deathtouch until end of turn.
Draw a card.

Murder

Altar's Reap

As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.

Run Away Together

Choose two target creatures controlled by different players. Return those creatures to their owners' hands.

Diminish

Target creature has base power and toughness 1/1 until end of turn.

Elusive Spellfist

Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn and can't be blocked this turn.

Swamp

Rona, Sheoldred's Faithful

Whenever you cast an instant or sorcery spell, each opponent loses 1 life.
You may cast this card from your graveyard by discarding two cards in addition to paying its other costs.

Callous Dismissal

Return target nonland permanent to its owner's hand.
Amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

You Come to a River

Choose one —
• Fight the Current — Return target nonland permanent to its owner's hand.
• Find a Crossing — Target creature gets +1/+0 until end of turn and can't be blocked this turn.

Leapfrog

This creature has flying as long as you've cast an instant or sorcery spell this turn.

Skulduggery

Until end of turn, target creature you control gets +1/+1 and target creature an opponent controls gets -1/-1.

Worthy Cost

As an additional cost to cast this spell, sacrifice a creature.
Exile target creature or planeswalker.

Shrivel

All creatures get -1/-1 until end of turn.

Sky Theater Strix

Flying
Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn.

Unwind

Counter target noncreature spell. Untap up to three lands.

Blessing of Belzenlok

Target creature gets +2/+1 until end of turn. If it's legendary, it also gains lifelink until end of turn.