: Add . ( represents colorless mana.)

, : Draw a card. Activate only if you have no cards in hand.

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

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

When you control no Islands, sacrifice Sea Serpent.

Flying, protection from red

Seachrome Coast enters tapped unless you control two or fewer other lands.

: Add or .

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)

Flash

Whenever this creature deals combat damage to a player, draw a card.

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

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.

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.

Search your library for a basic land card, put it onto the battlefield, then shuffle.

Suspend 2— (Rather than cast this card from your hand, you may pay and exile it with two time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)

When Search the City enters, exile the top five cards of your library.

Whenever you play a card with the same name as one of the exiled cards, you may put one of those cards with that name into its owner's hand. Then if there are no cards exiled with Search the City, sacrifice it. If you do, take an extra turn after this one.

Target player reveals their hand. You gain life equal to the number of cards in that player's hand.

Flying

: Searchlight Geist gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

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

: Add .

Seaside Citadel enters tapped.

: Add , , or .

Whenever a creature you control enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Whenever you cast a spell that targets a creature you control, draw a card.

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

— Create a 1/1 white Rabbit creature token.

— Exile target nonland permanent. Its controller draws a card.

— Return target permanent card with mana value 3 or less from your graveyard to the battlefield with an indestructible counter on it.

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

Lifelink

, 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.

Secluded Steppe enters tapped.

: Add .

Cycling (, Discard this card: Draw a card.)

For each token you control, create a token that's a copy of that permanent.

Exile target attacking creature.

Draw a card.

: Add .

: Add one mana of any color. Spend this mana only to cast a spell that shares a watermark with Secret Base.

Secret Passage enters tapped.

: Add or .

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

You and target opponent each draw three cards.

As long as you have more cards in hand than each opponent, Secretkeeper gets +2/+2 and has flying.

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)

Draw two cards. If you have the city's blessing, draw three cards instead.

Exile target nonland permanent. Its controller creates a 1/1 white Soldier creature token.

Squad (As an additional cost to cast this spell, you may pay any number of times. When this creature enters, create that many tokens that are copies of it.)

Vigilance

Whenever a creature token you control enters, put a +1/+1 counter on it.

Enchant creature

As long as enchanted creature is attacking alone, it can't be blocked.

Enchanted creature has "Whenever this creature deals combat damage to a player, it connives." (Its controller draws a card, then discards a card. If they discarded a nonland card, they put a +1/+1 counter on this creature.)

You may pay rather than pay this spell's mana cost. Spend only mana produced by Treasures to cast it this way.

Menace

Ward—Pay 3 life. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays 3 life.)

Magecraft — Whenever you cast or copy an instant or sorcery spell, create a 1/1 black and green Pest creature token with "When this creature dies, you gain 1 life."

Flying

Whenever Sedraxis Specter deals combat damage to a player, that player discards a card.

Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Look at the top three cards of your library. Put one of those cards into your hand and the rest on the bottom of your library in any order. If this spell was cast from anywhere other than your hand, put each of those cards into your hand instead.

Whenever a land enters, its controller creates a 1/1 green Snake creature token.

Vigilance, haste

Valiant — Whenever Seedglaive Mentor becomes the target of a spell or ability you control for the first time each turn, put a +1/+1 counter on it.

Target creature gets +1/+1 until end of turn.

Target creature gets +1/+1 until end of turn.

Target creature gets +1/+1 until end of turn.

Choose one at random —

• You get an emblem with "At the beginning of your upkeep, pay . If you don't, you lose the game."

• Each player discards their hand.

• Planeswalk to Pools of Becoming. (Once there, you can roll the planar die only if you're playing Planechase.)

• For each opponent, exile cards from the top of their library until you exile a nonland card. You may cast those cards without paying their mana costs.

• Destroy all creatures and non-Bolas planeswalkers.

• You get an emblem with "You can cast nonland cards from your sideboard."

Search your library for up to three basic land cards, reveal them, put them into your hand, then shuffle.

Mill seven cards. Then put all cards that have an Adventure from among the milled cards into your hand.

: Seeker of Sunlight explores. Activate only as a sorcery. (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 this creature, then put the card back or put it into your graveyard.)

Menace (This creature can't be blocked except by two or more creatures.)

Whenever one or more artifacts and/or creatures you control are put into a graveyard from the battlefield, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

: Add .

, : Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

: Add .

, Sacrifice Seething Landscape: Search your library for a basic Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

Cycling (, Discard this card: Draw a card.)

Add .