Island

Samite Healer

{T}: Prevent the next 1 damage that would be dealt to any target this turn.

Power Sink

Counter target spell unless its controller pays {X}. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana.

Serendib Efreet

Flying
At the beginning of your upkeep, Serendib Efreet deals 1 damage to you.

Pearled Unicorn

Disenchant

Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Rod of Ruin

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

Phantom Monster

Plains

Black Vise

As Black Vise enters, choose an opponent.
At the beginning of the chosen player's upkeep, Black Vise deals X damage to that player, where X is the number of cards in their hand minus 4.

Savannah Lions

Sol Ring

Sea Serpent

Sea Serpent can't attack unless defending player controls an Island.
When you control no Islands, sacrifice Sea Serpent.

Clone

You may have Clone enter as a copy of any creature on the battlefield.

Unsummon

Return target creature to its owner's hand.

Control Magic

Enchant creature
You control enchanted creature.

Lord of Atlantis

Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

Juggernaut

This creature attacks each combat if able.
This creature can't be blocked by Walls.

Phantasmal Terrain

Enchant land
As Phantasmal Terrain enters, choose a basic land type.
Enchanted land is the chosen type.

Merfolk of the Pearl Trident

Counterspell

Braingeyser

Mahamoti Djinn

Flying (This creature can't be blocked except by creatures with flying or reach.)

Air Elemental

Mesa Pegasus

Flying; banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)