Shrivel

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

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Verdant Haven

Enchant land
When Verdant Haven enters the battlefield, you gain 2 life.
Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color.

Vial of Poison

{1}, Sacrifice Vial of Poison: Target creature gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

Pacifism

Enchant creature
Enchanted creature can't attack or block.

Steelform Sliver

Predatory Sliver

Opportunity

Prevent all combat damage that would be dealt this turn.

Elvish Mystic

Lava Axe

Lava Axe deals 5 damage to target player or planeswalker.

Marauding Maulhorn

Marauding Maulhorn attacks each combat if able unless you control a creature named Advocate of the Beast.

Fortify

Choose one —
• Creatures you control get +2/+0 until end of turn.
• Creatures you control get +0/+2 until end of turn.

Wall of Swords

Defender (This creature can't attack.)
Flying

Mind Rot

Giant Growth

Target creature gets +3/+3 until end of turn.

Merfolk Spy

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever Merfolk Spy deals combat damage to a player, that player reveals a card at random from their hand.

Banisher Priest

When Banisher Priest enters the battlefield, exile target creature an opponent controls until Banisher Priest leaves the battlefield. (That creature returns under its owner's control.)

Trained Condor

Flying
Whenever Trained Condor attacks, another target creature you control gains flying until end of turn.

Show of Valor

Target creature gets +2/+4 until end of turn.

Mutavault

{T}: Add {C}.
{1}: Mutavault becomes a 2/2 creature with all creature types until end of turn. It's still a land.

Child of Night

Coral Merfolk

Dark Favor

Enchant creature
When Dark Favor enters the battlefield, you lose 1 life.
Enchanted creature gets +3/+1.

Frost Breath

Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.

Sporemound

Landfall — Whenever a land enters the battlefield under your control, create a 1/1 green Saproling creature token.

Voracious Wurm

Voracious Wurm enters the battlefield with X +1/+1 counters on it, where X is the amount of life you've gained this turn.

Festering Newt

When Festering Newt dies, target creature an opponent controls gets -1/-1 until end of turn. That creature gets -4/-4 instead if you control a creature named Bogbrew Witch.

Blessing

Enchant creature
{W}: Enchanted creature gets +1/+1 until end of turn.

Hunt the Weak

Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control. (Each deals damage equal to its power to the other.)

Windstorm

Windstorm deals X damage to each creature with flying.

Blur Sliver

Sliver creatures you control have haste. (They can attack and {T} as soon as they come under your control.)

Oath of the Ancient Wood

Whenever Oath of the Ancient Wood or another enchantment enters the battlefield under your control, you may put a +1/+1 counter on target creature.

Lay of the Land

Search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Rod of Ruin

{3}, {T}: Rod of Ruin deals 1 damage to any target.

Deadly Recluse

Reach (This creature can block creatures with flying.)
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Sensory Deprivation

Enchant creature
Enchanted creature gets -3/-0.

Shock

Canyon Minotaur

Quicken

The next sorcery spell you cast this turn can be cast as though it had flash. (It can be cast any time you could cast an instant.)
Draw a card.

Advocate of the Beast

At the beginning of your end step, put a +1/+1 counter on target Beast creature you control.

Spell Blast

Counter target spell with mana value X. (For example, if that spell's mana cost is {3}{U}{U}, X is 5.)

Scavenging Ooze

{G}: Exile target card from a graveyard. If it was a creature card, put a +1/+1 counter on Scavenging Ooze and you gain 1 life.

Flames of the Firebrand

Flames of the Firebrand deals 3 damage divided as you choose among one, two, or three targets.

Quag Sickness

Enchant creature
Enchanted creature gets -1/-1 for each Swamp you control.

Gladecover Scout

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Demolish

Stonehorn Chanter

{5}{W}: Stonehorn Chanter gains vigilance and lifelink until end of turn. (Attacking doesn't cause it to tap. Damage dealt by it also causes you to gain that much life.)