Mountain

Ancient Carp

Fish

Island

Sleep with the Fishes

Enchant creature
When Sleep with the Fishes enters the battlefield, tap enchanted creature and you create a 1/1 blue Fish creature token with "This creature can't be blocked."
Enchanted creature doesn't untap during its controller's untap step.

Fleet Swallower

Whenever Fleet Swallower attacks, target player mills half their library, rounded up.

Mystic Monastery

Mystic Monastery enters the battlefield tapped.
{T}: Add {U}, {R}, or {W}.

Ball Lightning

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Haste (This creature can attack and {T} as soon as it comes under your control.)
At the beginning of the end step, sacrifice Ball Lightning.

Plains

Have

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Red Herring

Haste
Red Herring attacks each combat if able.
{2}, Sacrifice Red Herring: Draw a card.

Rain of Blades

Rain of Blades deals 1 damage to each attacking creature.

Stinging Lionfish

Whenever you cast your first spell during each opponent's turn, you may tap or untap target nonland permanent.

Moat Piranhas

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Mystic Skyfish

Whenever you draw your second card each turn, Mystic Skyfish gains flying until end of turn.

Frost Fair Lure Fish

When Frost Fair Lure Fish enters the battlefield, create two 1/1 blue Fish creature tokens and two tapped Treasure tokens.
Fish you control have haste and can't be blocked by Humans.
Foretell {3}{U}{R}

Wavebreak Hippocamp

Whenever you cast your first spell during each opponent's turn, draw a card.

Wrath of God

Destroy all creatures. They can't be regenerated.

Rain of Embers

Rain of Embers deals 1 damage to each creature and each player.

Command the Storm

Command the Storm deals 5 damage to target creature.