Voracious Tome-Skimmer

Flying
Whenever you cast a spell during an opponent's turn, you may pay 1 life. If you do, draw a card.

Murky Sewer

This land enters tapped unless a player has 13 or less life.
{T}: Add {U} or {B}.

Island

Commander's Sphere

{T}: Add one mana of any color in your commander's color identity.
Sacrifice this artifact: Draw a card.

Eel Umbra

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
Enchanted creature gets +1/+1.
Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)

Dreams of Laguna

Surveil 1, then draw a card. (To surveil 1, look at the top card of your library. You may put it into your graveyard.)
Flashback {3}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Into the Roil

Kicker {1}{U} (You may pay an additional {1}{U} as you cast this spell.)
Return target nonland permanent to its owner's hand. If this spell was kicked, draw a card.

Bender's Waterskin

Untap this artifact during each other player's untap step.
{T}: Add one mana of any color.

Mocking Sprite

Flying
Instant and sorcery spells you cast cost {1} less to cast.

Treno, Dark City

This land enters tapped.
{T}: Add {U} or {B}.

Submerged Boneyard

Dreamspoiler Witches

Flying
Whenever you cast a spell during an opponent's turn, you may have target creature get -1/-1 until end of turn.

Whoosh!

Think Twice

Draw a card.
Flashback {2}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Glamermite

Flash
Flying
When this creature enters, choose one —
• Tap target creature.
• Untap target creature.

Instant Ramen

Flash
When this artifact enters, draw a card.
{2}, {T}, Sacrifice this artifact: You gain 3 life.

Essence Scatter

Soured Springs

This land enters tapped.
When this land enters, it deals 1 damage to target opponent.
{T}: Add {U} or {B}.

Snap

Return target creature to its owner's hand. Untap up to two lands.

Command Tower

{T}: Add one mana of any color in your commander's color identity.

Arcane Denial

Counter target spell. Its controller may draw up to two cards at the beginning of the next turn's upkeep.
You draw a card at the beginning of the next turn's upkeep.

Desperate Parry

Target creature gets -4/-0 until end of turn. (Then exile this card. You may cast the creature later from exile.)

Obyra's Attendants

Obyra's Attendants // Desperate Parry

Contaminated Aquifer

({T}: Add {U} or {B}.)
This land enters tapped.

Run Away Together

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

Fight On!

Return up to two target creature cards from your graveyard to your hand.

Stop Cold

Flash
Enchant artifact or creature
When this Aura enters, tap enchanted permanent.
Enchanted permanent loses all abilities and doesn't untap during its controller's untap step.

Go for the Throat

Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
Draw a card.

Serpent's Pass

This land enters tapped.
{T}: Add {U} or {B}.
{4}, {T}, Sacrifice this land: Draw a card.

Pestermite

Flash
Flying
When this creature enters, you may tap or untap target permanent.

Scion of Stygia

Flash
Cone of Cold — When this creature enters, choose target creature an opponent controls, then roll a d20.
1—9 | Tap that creature.
10—20 | Tap that creature. It doesn't untap during its controller's next untap step.

Counterspell

Swamp

Dismal Backwater

This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {U} or {B}.

Faerie Trickery

Counter target non-Faerie spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Faerie Invaders

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

Divert Disaster

Counter target spell unless its controller pays {2}. If they do, you create a Lander token. (It's an artifact with "{2}, {T}, Sacrifice this token: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.")

Impulse

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 any order.

Sinister Hideout

This land enters tapped.
{T}: Add {U} or {B}.
{4}, {T}: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)