Sandstorm

Instant       (G)

Sandstorm deals 1 damage to each attacking creature.

Savannah Lions

Creature - Cat       (W)

2/1

Scathe Zombies

Creature - Zombie       (2B)

2/2

Scavenging Ghoul

Creature - Zombie       (3B)

At the beginning of each end step, put a corpse counter on Scavenging Ghoul for each creature that died this turn.

Remove a corpse counter from Scavenging Ghoul: Regenerate Scavenging Ghoul.

2/2

Scryb Sprites

Creature - Faerie       (G)

Flying

1/1

Sea Serpent

Creature - Serpent       (5U)

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

When you control no Islands, sacrifice Sea Serpent.

5/5

Seeker

Enchantment - Aura       (2WW)

Enchant creature

Enchanted creature can't be blocked except by artifact creatures and/or white creatures.

Segovian Leviathan

Creature - Leviathan       (4U)

Islandwalk

3/3

Sengir Vampire

Creature - Vampire       (3BB)

Flying

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

4/4

Serra Angel

Creature - Angel       (3WW)

Flying

Vigilance (Attacking doesn't cause this creature to tap.)

4/4

Shanodin Dryads

Creature - Nymph Dryad       (G)

Forestwalk

1/1

Shapeshifter

Artifact Creature - Shapeshifter       (6)

As Shapeshifter enters the battlefield, choose a number between 0 and 7.

At the beginning of your upkeep, you may choose a number between 0 and 7.

Shapeshifter's power is equal to the last chosen number and its toughness is equal to 7 minus that number.

0/7

Shatter

Instant       (1R)

Destroy target artifact.

Shivan Dragon

Creature - Dragon       (4RR)

Flying

R: Shivan Dragon gets +1/+0 until end of turn.

5/5

Simulacrum

Instant       (1B)

You gain life equal to the damage dealt to you this turn. Simulacrum deals damage to target creature you control equal to the damage dealt to you this turn.

Sindbad

Creature - Human       (1U)

[T]: Draw a card and reveal it. If it isn't a land card, discard it.

1/1

Siren's Call

Instant       (U)

Cast Siren's Call only during an opponent's turn, before attackers are declared.

Creatures the active player controls attack this turn if able.

At the beginning of the next end step, destroy all non-Wall creatures that player controls that didn't attack this turn. Ignore this effect for each creature the player didn't control continuously since the beginning of the turn.

Sisters of the Flame

Creature - Human Shaman       (1RR)

[T]: Add R to your mana pool.

2/2

Sleight of Mind

Instant       (U)

Change the text of target spell or permanent by replacing all instances of one color word with another. (For example, you may change "target black spell" to "target blue spell." This effect lasts indefinitely.)

Smoke

Enchantment       (RR)

Players can't untap more than one creature during their untap steps.

Sorceress Queen

Creature - Human Wizard       (1BB)

[T]: Target creature other than Sorceress Queen has base power and toughness 0/2 until end of turn.

1/1

Soul Net

Artifact       (1)

Whenever a creature dies, you may pay 1. If you do, you gain 1 life.

Spell Blast

Instant       (XU)

Counter target spell with converted mana cost X. (For example, if that spell's mana cost is 3UU, X is 5.)

Spirit Link

Enchantment - Aura       (W)

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

Whenever enchanted creature deals damage, you gain that much life.

Spirit Shackle

Enchantment - Aura       (BB)

Enchant creature

Whenever enchanted creature becomes tapped, put a -0/-2 counter on it.