Merfolk of the Pearl Trident

Air Elemental

Creature — Elemental (4/4)

Flying

Birds of Paradise

Creature — Bird (0/1)

Flying
: Add one mana of any color.

Goblin Balloon Brigade

Creature — Goblin Warrior (1/1)

: Goblin Balloon Brigade gains flying until end of turn.

Llanowar Elves

Creature — Elf Druid (1/1)

: Add .

Lord of Atlantis

Creature — Merfolk (2/2)

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

Mons's Goblin Raiders

Creature — Goblin (1/1)

Phantasmal Forces

Creature — Illusion (4/1)

Flying
At the beginning of your upkeep, sacrifice Phantasmal Forces unless you pay .

Pirate Ship

Creature — Human Pirate (4/3)

Pirate Ship can't attack unless defending player controls an Island.
: Pirate Ship deals 1 damage to any target.
When you control no Islands, sacrifice Pirate Ship.

Prodigal Sorcerer

Creature — Human Wizard (1/1)

: Prodigal Sorcerer deals 1 damage to any target.

Savannah Lions

Creature — Cat (2/1)

Sea Serpent

Creature — Serpent (5/5)

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

Vesuvan Doppelganger

Creature — Shapeshifter (0/0)

You may have Vesuvan Doppelganger enter the battlefield as a copy of any creature on the battlefield, except it doesn't copy that creature's color and it has "At the beginning of your upkeep, you may have this creature become a copy of target creature, except it doesn't copy that creature's color and it has this ability."

Wall of Air

Creature — Wall (1/5)

Defender, flying (This creature can't attack, and it can block creatures with flying.)

Wall of Water

Creature — Wall (0/5)

Defender (This creature can't attack.)
: Wall of Water gets +1/+0 until end of turn.

Wall of Wood

Creature — Wall (0/3)

Defender (This creature can't attack.)

Water Elemental

Creature — Elemental (5/4)

Will-o'-the-Wisp

Creature — Spirit (0/1)

Flying (This creature can't be blocked except by creatures with flying or reach.)
: Regenerate Will-o'-the-Wisp. (The next time this creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

Flight

Enchantment — Aura

Enchant creature
Enchanted creature has flying.

Black Knight

Creature — Human Knight (2/2)

First strike (This creature deals combat damage before creatures without first strike.)
Protection from white (This creature can't be blocked, targeted, dealt damage, or enchanted by anything white.)

Bog Wraith

Creature — Wraith (3/3)

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)