Spells you cast cost less to cast.

When Stone Retrieval Unit enters the battlefield, create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")

Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.)

Stonesplitter Bolt deals X damage to target creature or planeswalker. If this spell was bargained, it deals twice X damage to that permanent instead.

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

Merfolk spells and Wizard spells you cast cost less to cast.

When you next cast an instant or sorcery spell this turn, copy that spell X times. You may choose new targets for the copies.

Ward

Whenever you cast your second spell each turn, copy it, except the copy isn't legendary. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)

Flying

Instant and sorcery spells you cast cost less to cast.

Whenever you cast an instant or sorcery spell, Storm Skreelix gets +2/+0 until end of turn.

Each creature card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard. (You may cast cards from your graveyard for their escape cost.)

Whenever chaos ensues, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

At the beginning of combat on your turn, target creature you control gets +2/+0 and gains trample and haste until end of turn.

Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

Trample

Megamorph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

Stormkeld Vanguard can't be blocked by creatures with power 2 or less.

Kicker and/or (You may pay an additional and/or as you cast this spell.)

When Stormscape Battlemage enters the battlefield, if it was kicked with its kicker, you gain 3 life.

When Stormscape Battlemage enters the battlefield, if it was kicked with its kicker, destroy target nonblack creature. That creature can't be regenerated.

Flying, first strike

Megamorph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

When Stormwing Dragon is turned face up, put a +1/+1 counter on each other Dragon creature you control.

Flying

Whenever you cast an Adventure spell, draw a card.

Destroy target creature with toughness 3 or less.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Flying

Megamorph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

When Stratus Dancer is turned face up, counter target instant or sorcery spell.

Target player mills four cards. You shuffle up to four cards from your graveyard into your library.

Replicate (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Enchant creature

Enchanted creature gets +1/+2 and has protection from black.

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Kicker (You may pay an additional as you cast this spell.)

Creatures you control get +1/+1 until end of turn. If this spell was kicked, Zombie creatures you control get an additional +2/+2 until end of turn.

Multikicker (You may pay an additional any number of times as you cast this spell.)

Choose target creature, then choose another target creature for each time this spell was kicked. Put X +1/+1 counters on each of them.

Instant and sorcery spells players cast have demonstrate. (Whenever a player casts an instant or sorcery spell, they may copy it. If they do, they choose an opponent to also copy it. Players may choose new targets for their copies.)

Whenever chaos ensues, return up to one target instant or sorcery card from a graveyard to its owner's hand.

Enchant creature

Equip abilities you activate that target enchanted creature cost less to activate.

Aura spells you cast that target enchanted creature cost less to cast.

Enchanted creature gets +2/+2 for each Aura and Equipment attached to it.

Kicker and/or (You may pay an additional and/or as you cast this spell.)

When Stronghold Arena enters the battlefield, you gain 3 life for each time it was kicked.

Whenever one or more creatures you control deal combat damage to a player, you may reveal the top card of your library and put it into your hand. If you do, you lose life equal to its mana value.

Struggle deals damage to target creature equal to the number of lands you control.

Whenever you cast a noncreature spell, you gain 2 life.

Sturdy Hatchling enters the battlefield with four -1/-1 counters on it.

: Sturdy Hatchling gains shroud until end of turn. (It can't be the target of spells or abilities.)

Whenever you cast a green spell, remove a -1/-1 counter from Sturdy Hatchling.

Whenever you cast a blue spell, remove a -1/-1 counter from Sturdy Hatchling.

If an opponent controls a Forest and you control an Island, you may cast this spell without paying its mana cost.

Put target creature on top of its owner's library.

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)

Target player sacrifices a creature.

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)

Until end of turn, creatures target player controls lose all abilities and have base power and toughness 0/2.

Cast this spell only if you were dealt damage this turn by a red instant or sorcery spell.

Suffocation deals 4 damage to the controller of the last red instant or sorcery spell that dealt damage to you this turn.

Draw a card at the beginning of the next turn's upkeep.

Sulfurous Blast deals 2 damage to each creature and each player. If you cast this spell during your main phase, Sulfurous Blast deals 3 damage to each creature and each player instead.

Summary Judgment deals 3 damage to target tapped creature.

Addendum — If you cast this spell during your main phase, it deals 5 damage instead.

If a creature spell you cast this turn was countered by a spell or ability an opponent controlled, you may pay rather than pay this spell's mana cost.

Look at the top seven cards of your library. You may put a creature card from among them onto the battlefield. Put the rest on the bottom of your library in any order.

Whenever you cast a spell from your hand, reveal the top X cards of your library, where X is that spell's mana value. You may cast a spell with mana value X or less from among cards revealed this way without paying its mana cost. Put the rest on the bottom of your library in a random order.

Sundering Stroke deals 7 damage divided as you choose among one, two, or three targets. If at least seven red mana was spent to cast this spell, instead Sundering Stroke deals 7 damage to each of those permanents and/or players.

Equipped creature gets +4/+0.

, Unattach Sunforger: Search your library for a red or white instant card with mana value 4 or less and cast that card without paying its mana cost. Then shuffle.

Equip

Sunken Palace enters the battlefield tapped.

: Add .

, , Exile seven cards from your graveyard: Add . When you spend this mana to cast a spell or activate an ability, copy that spell or ability. You may choose new targets for the copy. (Mana abilities can't be copied.)

Defender (This creature can't attack.)

Green spells and blue spells you cast cost less to cast.

Sunburst (This enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.)

This spell has flash as long as you control a Spirit.

When you cast this spell, tap up to two target creatures you don't control.

Enchant creature you control

Enchanted creature gets +1/+2.

As an additional cost to cast this spell, discard a red or green card.

Target creature gains trample and gets +X/+0 until end of turn, where X is that creature's mana value.

Ripple 4 (When you cast this spell, you may reveal the top four cards of your library. You may cast spells with the same name as this spell from among those cards without paying their mana costs. Put the rest on the bottom of your library.)

Return target permanent to its owner's hand.

Ripple 4 (When you cast this spell, you may reveal the top four cards of your library. You may cast spells with the same name as this spell from among those cards without paying their mana costs. Put the rest on the bottom of your library.)

Surging Flame deals 2 damage to any target.

First strike

Ripple 4 (When you cast this spell, you may reveal the top four cards of your library. You may cast spells with the same name as this spell from among those cards without paying their mana costs. Put the rest on the bottom of your library.)

When Surprise Party enters the battlefield, yell "Surprise" and put onto the battlefield any number of printed Clown Robot tokens that aren't touching each other, that you hid on the battlefield before you cast Surprise Party, and that weren't spotted by an opponent before you cast Surprise Party.

Robots you control get +1/+0 and have vigilance.

Return an instant card at random from your graveyard to your hand.

Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

You gain 2 life. Then if you have more life than an opponent, draw a card.

Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

This spell costs less to cast if you've sacrificed an artifact this turn.

This spell can't be countered. (This includes by the ward ability.)

Suspicious Detonation deals 4 damage to target creature.

, : Create a colorless snow artifact token named Icy Manalith with ": Add one mana of any color."

, : Look at the top four cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order.

Whenever you cast an instant or sorcery spell, you may copy that spell. You may choose new targets for the copy.