You may play an additional land on each of your turns.

Landfall -- Whenever a land enters the battlefield under your control, you may draw a card.

When Amphin Mutineer enters the battlefield, exile up to one target non-Salamander creature. That creature's controller creates a 4/3 blue Salamander Warrior creature token.

Encore {4}{U}{U} ({4}{U}{U}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

{2}{U}: Target creature can't be blocked this turn.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Defender

When Biolume Egg enters the battlefield, scry 2.

When you sacrifice Biolume Egg, return it to the battlefield transformed under its owner's control at the beginning of the next end step.

Sacrifice two Islands: Biolume Serpent can't be blocked this turn.

This spell costs {1} less to cast for each instant and sorcery card in your graveyard.

Deep-Sea Serpent can't attack unless defending player controls an Island.

Fin-Clade Fugitives can't be blocked by creatures with power 2 or less.

Encore {4}{G} ({4}{G}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

Descend 4 -- Frilled Cave-Wurm gets +2/+0 as long as there are four or more permanent cards in your graveyard.

Gudul Lurker can't be blocked.

Megamorph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)

When Invasion of Segovia enters the battlefield, create two 1/1 blue Kraken creature tokens with trample.

Noncreature spells you cast have convoke. (Your creatures can help cast those spells. Each creature you tap while casting a noncreature spell pays for {1} or one mana of that creature's color.)

At the beginning of your end step, untap up to four target creatures.

This spell can't be countered.

At the beginning of each upkeep, create a 3/3 blue Serpent creature token named Koma's Coil.

Sacrifice another Serpent: Choose one --

• Tap target permanent. Its activated abilities can't be activated this turn.

• Koma, Cosmos Serpent gains indestructible until end of turn.

Flying

{7}{U}: Adapt 4. This ability costs {1} less to activate for each instant and sorcery card in your graveyard. (If this creature has no +1/+1 counters on it, put four +1/+1 counters on it.)

Scrapdiver Serpent can't be blocked as long as defending player controls an artifact.

Sea Monster can't attack unless defending player controls an Island.

Krakens, Leviathans, Octopuses, and Serpents you control can't be blocked except by Krakens, Leviathans, Octopuses, and Serpents.

Serpent of the Endless Sea's power and toughness are each equal to the number of Islands you control.

Serpent of the Endless Sea can't attack unless defending player controls an Island.

Defender

Landfall -- Whenever a land enters the battlefield under your control, Shoal Serpent loses defender until end of turn.

Whenever Shrouded Serpent attacks, defending player may pay {4}. If that player doesn't, Shrouded Serpent can't be blocked this turn.

Slipstream Serpent can't attack unless defending player controls an Island.

When you control no Islands, sacrifice Slipstream Serpent.

Morph {5}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

{3}{U}: Return Sliptide Serpent to its owner's hand.

Affinity for artifacts

Artifact landcycling {2} ({2}, Discard this card: Search your library for an artifact land card, reveal it, put it into your hand, then shuffle.)

Defender

Metalcraft -- As long as you control three or more artifacts, Spire Serpent gets +2/+2 and can attack as though it didn't have defender.

Steelclad Serpent can't attack unless you control another artifact.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Cycling {U} ({U}, Discard this card: Draw a card.)

Sword Coast Serpent can't be blocked as long as you've cast a noncreature spell this turn.

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Return target creature to its owner's hand. (Then exile this card. You may cast the creature later from exile.)

Trample

Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)

At the beginning of your upkeep, all lands you control phase out. (They phase in before you untap during your next untap step.)

At the beginning of your upkeep, mill seven cards.

This spell costs {1} less to cast for each instant and sorcery card in your graveyard.

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)

Verazol, the Split Current enters the battlefield with a +1/+1 counter on it for each mana spent to cast it.

Whenever you cast a kicked spell, you may remove two +1/+1 counters from Verazol. If you do, copy that spell. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)

Kicker {2} (You may pay an additional {2} as you cast this spell.)

Vodalian Serpent can't attack unless defending player controls an Island.

If Vodalian Serpent was kicked, it enters the battlefield with four +1/+1 counters on it.

When Wormfang Newt enters the battlefield, exile a land you control.

When Wormfang Newt leaves the battlefield, return the exiled card to the battlefield under its owner's control.

{3}{U}: Target creature can't be blocked this turn.

Whenever Xolatoyac, the Smiling Flood enters the battlefield or attacks, put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it.

At the beginning of your end step, untap each permanent you control with a counter on it.