Return up to three target creatures your opponents control to their owners' hands. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

When Sea Hag enters, creatures your opponents control get -4/-0 until end of turn.

Flash

Enchant creature

Enchanted creature gets +0/+2 as long as it's a Pirate. Otherwise, it gets -2/-0.

Sea of Clouds enters tapped unless you have two or more opponents.

: Add or .

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

When you control no Islands, sacrifice Sea Serpent.

: Sea Spirit gets +1/+0 until end of turn.

: Regenerate Sea Troll. Activate only if Sea Troll blocked or was blocked by a blue creature this turn.

Flying

Blue legendary creatures you control have "bands with other legendary creatures." (Any legendary creatures can attack in a band as long as at least one has "bands with other legendary creatures." Bands are blocked as a group. If at least two legendary creatures you control, one of which has "bands with other legendary creatures," are blocking or being blocked by the same creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

Seafloor Debris enters tapped.

: Add .

, Sacrifice Seafloor Debris: Add one mana of any color.

: Seafloor Stalker gets +1/+0 until end of turn and can't be blocked this turn. This ability costs less to activate for each creature in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)

, : Search your library for a Merfolk permanent card, put it onto the battlefield, then shuffle.

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

When Seal from Existence enters, exile target nonland permanent an opponent controls until Seal from Existence leaves the battlefield.

Sacrifice Seal of Doom: Destroy target nonblack creature. It can't be regenerated.

Sacrifice Seal of Primordium: Destroy target artifact or enchantment.

Sacrifice Seal of Strength: Target creature gets +3/+3 until end of turn.

Look at the top X cards of target opponent's library. Exile one of those cards and put the rest back on top of that player's library in any order.

At the beginning of each upkeep, you may exile target creature card from your graveyard. If you do, create a token that's a copy of that card, except it's a Spirit in addition to its other types. Exile it at the beginning of the next end step.

Whenever you search your library, scry 1.

Scryfall — Whenever you scry, put a +1/+1 counter on Search Elemental. It can't be blocked this turn.

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, 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, 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.

Raid — At the beginning of your end step, if you attacked this turn, create a 1/1 red Goblin creature token.

Enchant land (Target a land as you cast this. This card enters attached to that land.)

Enchanted land is an Island.

: Add or .

: Add .

, , Sacrifice a Bird: Draw a card.

Choose up to five worth of modes. You may choose the same mode more than once.

— Put a +1/+1 counter on a creature you control. It gains vigilance and trample until end of turn.

— Choose artifact or enchantment. Destroy all permanents of the chosen type.

— Draw cards equal to the greatest power among creatures you control.

Choose up to five worth of modes. You may choose the same mode more than once.

— Each player sacrifices a creature of their choice.

— Draw a card for each creature that died under your control this turn.

— Each opponent loses X life, where X is the number of creature cards in your graveyard.

Choose up to five worth of modes. You may choose the same mode more than once.

— Create a tapped Treasure token.

— Exile the top two cards of your library. Until the end of your next turn, you may play them.

— Until the end of your next turn, whenever you cast a spell, Season of the Bold deals 2 damage to up to one target creature.

At the beginning of your upkeep, sacrifice Season of the Witch unless you pay 2 life.

At the beginning of the end step, destroy all untapped creatures that didn't attack this turn, except for creatures that couldn't attack.

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

Lifelink

When Seasoned Dungeoneer enters, 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.

Tasty (This creature can be attacked directly. If it is attacked, it can't block creatures that didn't attack it.)

: Add .

As this land enters, choose a creature type.

: Add .

: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type or activate an ability of a creature source of the chosen type.

At the beginning of your upkeep, if you have 5 or less life, sacrifice Second Chance and take an extra turn after this one.

Nonland permanents you control and permanent spells you control are enchantments in addition to their other types.

(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)

Secret Passage enters tapped.

: Add or .

, : Investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Exile target nonland card from your graveyard. Search your library for any number of cards with the same name as that card, reveal them, put them into your hand, then shuffle.