Homarid

Tidal Influence

Enchantment

Cast this spell only if no permanents named Tidal Influence are on the battlefield.
Tidal Influence enters the battlefield with a tide counter on it.
At the beginning of your upkeep, put a tide counter on Tidal Influence.
As long as there is exactly one tide counter on Tidal Influence, all blue creatures get -2/-0.
As long as there are exactly three tide counters on Tidal Influence, all blue creatures get +2/+0.
Whenever there are four or more tide counters on Tidal Influence, remove all tide counters from it.

Thallid Devourer

Creature — Fungus (2/2)

At the beginning of your upkeep, put a spore counter on Thallid Devourer.
Remove three spore counters from Thallid Devourer: Create a 1/1 green Saproling creature token.
Sacrifice a Saproling: Thallid Devourer gets +1/+2 until end of turn.

Thorn Thallid

Creature — Fungus (2/2)

At the beginning of your upkeep, put a spore counter on Thorn Thallid.
Remove three spore counters from Thorn Thallid: It deals 1 damage to any target.

Spore Flower

Creature — Fungus (0/1)

At the beginning of your upkeep, put a spore counter on Spore Flower.
Remove three spore counters from Spore Flower: Prevent all combat damage that would be dealt this turn.

Elvish Farmer

Creature — Elf (0/2)

At the beginning of your upkeep, put a spore counter on Elvish Farmer.
Remove three spore counters from Elvish Farmer: Create a 1/1 green Saproling creature token.
Sacrifice a Saproling: You gain 2 life.

Icatian Moneychanger

Creature — Human (0/2)

Icatian Moneychanger enters the battlefield with three credit counters on it.
When Icatian Moneychanger enters the battlefield, it deals 3 damage to you.
At the beginning of your upkeep, put a credit counter on Icatian Moneychanger.
Sacrifice Icatian Moneychanger: You gain 1 life for each credit counter on Icatian Moneychanger. Activate only during your upkeep.

Deep Spawn

Creature — Homarid (6/6)

Trample
At the beginning of your upkeep, sacrifice Deep Spawn unless you mill two cards.
: Deep Spawn gains shroud until end of turn and doesn't untap during your next untap step. Tap Deep Spawn. (A creature with shroud can't be the target of spells or abilities.)

Svyelunite Priest

Creature — Merfolk Cleric (1/1)

, : Target creature gains shroud until end of turn. Activate only during your upkeep. (It can't be the target of spells or abilities.)

Vodalian War Machine

Creature — Wall (0/4)

Defender (This creature can't attack.)
Tap an untapped Merfolk you control: Vodalian War Machine can attack this turn as though it didn't have defender.
Tap an untapped Merfolk you control: Vodalian War Machine gets +2/+1 until end of turn.
When Vodalian War Machine dies, destroy all Merfolk tapped this turn to pay for its abilities.

River Merfolk

Creature — Merfolk (2/1)

: River Merfolk gains mountainwalk until end of turn. (It can't be blocked as long as defending player controls a Mountain.)

Vodalian Mage

Creature — Merfolk Wizard (1/1)

, : Counter target spell unless its controller pays .

Seasinger

Creature — Merfolk (0/1)

When you control no Islands, sacrifice Seasinger.
You may choose not to untap Seasinger during your untap step.
: Gain control of target creature whose controller controls an Island for as long as you control Seasinger and Seasinger remains tapped.

Feral Thallid

Creature — Fungus (6/3)

At the beginning of your upkeep, put a spore counter on Feral Thallid.
Remove three spore counters from Feral Thallid: Regenerate Feral Thallid.

Homarid Shaman

Creature — Homarid Shaman (2/1)

: Tap target green creature.

Merseine

Enchantment — Aura

Enchant creature
Merseine enters the battlefield with three net counters on it.
Enchanted creature doesn't untap during its controller's untap step if Merseine has a net counter on it.
Pay enchanted creature's mana cost: Remove a net counter from Merseine. Only the controller of the enchanted creature may activate this ability.

Thallid

Creature — Fungus (1/1)

At the beginning of your upkeep, put a spore counter on Thallid.
Remove three spore counters from Thallid: Create a 1/1 green Saproling creature token.

Vodalian Knights

Creature — Merfolk Knight (2/2)

First strike
Vodalian Knights can't attack unless defending player controls an Island.
When you control no Islands, sacrifice Vodalian Knights.
: Vodalian Knights gains flying until end of turn.

Vodalian Soldiers

Creature — Merfolk Soldier (1/2)

Ebon Praetor

Creature — Avatar Praetor (5/5)

First strike, trample
At the beginning of your upkeep, put a -2/-2 counter on Ebon Praetor.
Sacrifice a creature: Remove a -2/-2 counter from Ebon Praetor. If the sacrificed creature was a Thrull, put a +1/+0 counter on Ebon Praetor. Activate only during your upkeep and only once each turn.

Farrelite Priest

Creature — Human Cleric (1/3)

: Add . If this ability has been activated four or more times this turn, sacrifice Farrelite Priest at the beginning of the next end step.