Whenever a Merfolk you control deals combat damage to a player, draw a card.

Flash

When Seal Away enters the battlefield, exile target tapped creature an opponent controls until Seal Away leaves the battlefield.

Sacrifice Seal of Cleansing: Destroy target artifact or enchantment.

Sacrifice Seal of Fire: It deals 2 damage to any target.

Sacrifice Seal of Removal: Return target creature to its owner's hand.

As Seal of the Guildpact enters the battlefield, choose two colors.

Each spell you cast costs less to cast for each of the chosen colors it is.

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

: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)

When Sealock Monster becomes monstrous, target land becomes an Island in addition to its other types.

Look at the top five cards of your library. You may put any number of them into your hand and the rest into your graveyard. You lose 3 life for each card you put into your hand this way.

Reorder your graveyard at random. An opponent chooses a card at random in your graveyard. If it's a creature card, put it onto the battlefield. Otherwise, exile it.

This spell costs less to cast for each creature you attacked with this turn.

When Search Party Captain enters the battlefield, draw a card.

Whenever a creature attacks you or a planeswalker you control, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Flying

When Searchlight Companion enters the battlefield, create a 1/1 colorless Spirit creature token.

Searing Barb deals 2 damage to any target. If it's a creature, it can't block this turn. Incubate 1. (Create an Incubator token with a +1/+1 counter on it and ": Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.)

Searing Blaze deals 1 damage to target player or planeswalker and 1 damage to target creature that player or that planeswalker's controller controls.

Landfall — If you had a land enter the battlefield under your control this turn, Searing Blaze deals 3 damage to that player or planeswalker and 3 damage to that creature instead.

Searing Flesh deals 7 damage to target opponent or planeswalker.

Whenever you gain life, you may pay . If you do, Searing Meditation deals 2 damage to any target.

Searing Spear deals 3 damage to any target.

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)

Searing Touch deals 1 damage to any target.

: Add .

Whenever Seascape Aerialist or another Ally enters the battlefield under your control, you may have Ally creatures you control gain flying until end of turn.

Seaside Citadel enters the battlefield tapped.

: Add , , or .

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.

Choose one or both —

• Return target creature card from your graveyard to your hand.

• Return target enchantment card from your graveyard to your hand.

Add one mana of any color. (Then exile this card. You may cast the creature later from exile.)

Lifelink

When Seasoned Dungeoneer enters the battlefield, you take the initiative.

Whenever you attack, target attacking Cleric, Rogue, Warrior, or Wizard gains protection from creatures until end of turn. It explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on the creature, then put the card back or put it into your graveyard.)

Whenever Seasoned Marshal attacks, you may tap target creature.

, Exile the top four cards of your library: The next time a source of your choice would deal damage to you this turn, prevent that damage.

Return any number of cards with different mana values from your graveyard to your hand. Put Seasons Past on the bottom of its owner's library.

Enchant creature or planeswalker you don't control

When Seatower Imprisonment enters the battlefield, conjure a card named Soldiers of the Watch onto the battlefield.

Enchanted permanent can't attack or block, and its activated abilities can't be activated.

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.

Soul Sear deals 5 damage to target creature or planeswalker. That permanent loses indestructible until end of turn.

Spectator Seating enters the battlefield tapped unless you have two or more opponents.

: Add or .

When Spirit of the Season enters the battlefield, it gains haste if it's summer. Put a +1/+1 counter on it if it's autumn. You gain 5 life if it's winter. If it's spring, search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Svyelun of Sea and Sky has indestructible as long as you control at least two other Merfolk.

Whenever Svyelun attacks, draw a card.

Other Merfolk you control have ward . (Whenever another Merfolk you control becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

+1: Choose up to two target creatures. Until your next turn, whenever either of those creatures deals combat damage, you draw a card.

−2: Tap up to two target nonland permanents. They don't untap during their controller's next untap step.

−7: Draw three cards. You get an emblem with "You may cast spells from your hand without paying their mana costs."

Indestructible

As long as your devotion to blue is less than five, Thassa isn't a creature. (Each in the mana costs of permanents you control counts toward your devotion to blue.)

At the beginning of your upkeep, scry 1.

: Target creature you control can't be blocked this turn.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I — Mill three cards.

II — Return up to two target snow permanent cards from your graveyard to your hand.

III — Choose three cards in each graveyard. Their owners shuffle those cards into their libraries.

(: Add or .)

Each player mills three cards. Then you return up to two creature cards from your graveyard to your hand. (To mill three cards, a player puts the top three cards of their library into their graveyard.)

Domain — When Voda Sea Scavenger enters the battlefield, look at the top X cards of your library, where X is the number of basic land types among lands you control. You may put one of those cards on top of your library. Put the rest on the bottom of your library in a random order.

: Search your library for an enchantment card and reveal that card. Put it into your hand, then discard a card at random. Then shuffle.

: Search your library for an instant card and reveal that card. Put it into your hand, then discard a card at random. Then shuffle.