Sengir Vampire
Casting Cost:
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.
$ 000
Sen Triplets
Casting Cost:
At the beginning of your upkeep, choose target opponent. This turn, that player can't play spells or activated abilities and plays with his or her hand revealed. You can play cards from that player's hand this turn.
Selvala, Heart of the Wilds
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 to your mana pool, where X is the greatest power among creatures you control.
Selvala, Explorer Returned
Parley — : Each player reveals the top card of his or her library. For each nonland card revealed this way, add to your mana pool and you gain 1 life. Then each player draws a card.
Selvala's Stampede
Council's dilemma - Starting with you, each player votes for wild or free. Reveal cards from the top of your library until you reveal a creature card for each wild vote. Put those creature cards onto the battlefield, then shuffle the rest into your library. You may put a permanent card from your hand onto the battlefield for each free vote.
Selfless Squire
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.
Selfless Spirit
Flying
Sacrifice Selfless Spirit: Creatures you control gain indestructible until end of turn.
Selesnya Sanctuary
Selesnya Sanctuary comes into play tapped.
When Selesnya Sanctuary comes into play, return a land you control to its owner's hand.
: Add to your mana pool.
Sek'Kuar, Deathkeeper
Whenever another nontoken creature you control is put into a graveyard from play, put a 3/1 black and red Graveborn creature token with haste into play.
Seize the Day
Untap target creature. After this phase, there is an additional combat phase followed by an additional main phase.
Flashback (You may play this card from your graveyard for its flashback cost. Then remove it from the game.)
Seizan, Perverter of Truth
At the beginning of each player's upkeep, that player loses 2 life and draws two cards.
Seismic Assault
Discard a land card: Seismic Assault deals 2 damage to target creature or player.
Seething Song
Add to your mana pool.