Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)

: Searing Spear Askari gains menace until end of turn. (It can't be blocked except by two or more creatures.)

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.

When Seasoned Buttoneer enters the battlefield, open an Attraction. (Put the top card of your Attraction deck onto the battlefield.)

Whenever you attack with three or more creatures, Seasoned Consultant gets +2/+0 until end of turn.

Discard a card: Tap Seasoned Hallowblade. It gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

When Seasoned Pyromancer enters the battlefield, discard two cards, then draw two cards. For each nonland card discarded this way, create a 1/1 red Elemental creature token.

, Exile Seasoned Pyromancer from your graveyard: Create two 1/1 red Elemental creature tokens.

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

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

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

All Sliver creatures have "This creature gets +1/+1 as long as you control a Swamp."

All Slivers have ": Regenerate this permanent." (The next time it would be destroyed, instead tap it, remove it from combat, and heal all damage on it.)

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.)

Reach

When Seed Guardian dies, create an X/X green Elemental creature token, where X is the number of creature cards in your graveyard.

: Target creature gets +3/+3 until end of turn. Untap that creature.

When Seedpod Caretaker enters the battlefield, choose one —

• Put a +1/+1 counter on target artifact or creature you control.

• Transform target Incubator token you control.

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

: Untap target creature.

: 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.)

When Seekers' Squire enters the battlefield, 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 this creature, then put the card back or put it into your graveyard.)

, , Discard a card: Target player mills three cards.

Whenever one or more creature cards are put into your graveyard from anywhere, venture into the dungeon. This ability triggers only once each turn. (To venture into the dungeon, enter the first room or advance to the next room.)

Create Undead — Whenever you complete a dungeon, return target creature card from your graveyard to the battlefield.

Whenever Segmented Wurm becomes the target of a spell or ability, put a -1/-1 counter on it.

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

When Seismic Elemental enters the battlefield, creatures without flying can't block this turn.

Trample

, Sacrifice a land: Draw a card.

Mountaincycling (, Discard this card: Search your library for a Mountain card, reveal it, put it into your hand, then shuffle.)

As long as you control a Plains, Sejiri Merfolk has first strike and lifelink. (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)

Whenever another nontoken creature you control dies, create a 3/1 black and red Graveborn creature token with haste.

: Exile target creature card from a graveyard, then populate. (Create a token that's a copy of a creature token you control.)

: Create a 1/1 green Saproling creature token.

: Creatures you control get +1/+1 until end of turn.

: Regenerate Selesnya Sentry.

, Sacrifice Selfless Cathar: Creatures you control get +1/+1 until end of turn.

Exile Selfless Glyphweaver: Creatures you control gain indestructible until end of turn.

Sacrifice Selfless Savior: Another target creature you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Flash

When Selfless Squire enters the battlefield, prevent all damage that would be dealt to you this turn.

Whenever damage that would be dealt to you is prevented, put that many +1/+1 counters on Selfless Squire.

Whenever Selhoff Occultist or another creature dies, target player mills a card.

When Seller of Songbirds enters the battlefield, create a 1/1 white Bird creature token with flying.

Vigilance

Whenever you cast a creature spell, create a 1/1 red Mercenary creature token with ": Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery."

: Choose a color. Add one mana of that color for each different power among creatures you control.

Whenever another creature enters the battlefield, its controller may draw a card if its power is greater than each other creature's power.

, : Add X mana in any combination of colors, where X is the greatest power among creatures you control.

Whenever Semblance Scanner or equipped creature deals combat damage to a player, if it's not a token, conjure a duplicate of it into your hand.

Reconfigure (: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

Flying

: Senate Courier gains vigilance until end of turn.

, : You gain 2 life.

, : Draw a card, then discard a card.

When Sengir Autocrat enters the battlefield, create three 0/1 black Serf creature tokens.

When Sengir Autocrat leaves the battlefield, exile all Serf tokens.

Flying

Whenever one or more other creatures die, put a +1/+1 counter on Sengir Connoisseur. This ability triggers only once each turn.

Flying (This creature can't be blocked except by creatures with flying or reach.)

Whenever a creature dealt damage by Sengir Vampire this turn dies, put a +1/+1 counter on Sengir Vampire.

Kinship — At the beginning of your upkeep, you may look at the top card of your library. If it shares a creature type with Sensation Gorger, you may reveal it. If you do, each player discards their hand, then draws four cards.

When Sensor Splicer enters the battlefield, create a 3/3 colorless Phyrexian Golem artifact creature token.

Golem creatures you control have vigilance.

When Sentinel of Lost Lore enters the battlefield, choose one or more —

• Return target card you own in exile that has an Adventure to your hand.

• Put target card you don't own in exile that has an Adventure on the bottom of its owner's library.

• Exile target player's graveyard.

Vigilance

Whenever Sentinel of the Nameless City enters the battlefield or attacks, create a Map token. (It's an artifact with ", , Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery.")

Haste

As long as an artifact entered the battlefield under your control this turn, creatures you control get +2/+2.

Battalion — Whenever Sentinel Sarah Lyons and at least two other creatures attack, Sentinel Sarah Lyons deals damage equal to the number of artifacts you control to target player.

Vigilance, reach