Unsettled Mariner

Changeling (This card is every creature type.)
Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays {1}.

Drown in Shapelessness

Return target creature to its owner's hand.

Fumigate

Destroy all creatures. You gain 1 life for each creature destroyed this way.

Serum Raker

Flying
When Serum Raker dies, each player discards a card.

Island

Disdainful Stroke

Counter target spell with mana value 4 or greater.

Essence Scatter

Pacifism

Enchant creature
Enchanted creature can't attack or block.

Plains

Rise from the Tides

Create a tapped 2/2 black Zombie creature token for each instant and sorcery card in your graveyard.

Tranquil Cove

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

Faerie Conclave

Faerie Conclave enters tapped.
{T}: Add {U}.
{1}{U}: Faerie Conclave becomes a 2/1 blue Faerie creature with flying until end of turn. It's still a land.

Talrand's Invocation

Create two 2/2 blue Drake creature tokens with flying.

Wall of Omens

Defender
When Wall of Omens enters, draw a card.

Chemister's Insight

Draw two cards.
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.)

Declaration in Stone

Exile target creature and all other creatures its controller controls with the same name as that creature. That player investigates for each nontoken creature exiled this way.

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

Azorius Skyguard

Flying, first strike
Creatures your opponents control get -1/-0.

Aetherling

{U}: Exile Aetherling. Return it to the battlefield under its owner's control at the beginning of the next end step.
{U}: Aetherling can't be blocked this turn.
{1}: Aetherling gets +1/-1 until end of turn.
{1}: Aetherling gets -1/+1 until end of turn.

Think Twice

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

Smite the Monstrous

Destroy target creature with power 4 or greater.

Smite

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.

Devious Cover-Up

Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may shuffle up to four target cards from your graveyard into your library.

Negate

Weatherseed Faeries

Mana Leak

Counter target spell unless its controller pays {3}.

Student of Ojutai

Whenever you cast a noncreature spell, you gain 2 life.

Sphinx's Insight

Draw two cards.
Addendum — If you cast this spell during your main phase, you gain 2 life.