Return all lands to their owners' hands.

When Sundering Titan enters or leaves the battlefield, choose a land of each basic land type, then destroy those lands.

Sundown Pass enters the battlefield tapped unless you control two or more other lands.

: Add or .

Exile all creatures. Incubate X, where X is the number of creatures exiled this way. (Create an Incubator token with X +1/+1 counters on it and ": Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.)

Whenever Sunfrill Imitator attacks, you may have it become a copy of another target Dinosaur you control, except its name is Sunfrill Imitator and it has this ability.

Whenever Sungold Sentinel enters the battlefield or attacks, exile up to one target card from a graveyard.

Coven — : Choose a color. Sungold Sentinel gains hexproof from that color until end of turn and can't be blocked by creatures of that color this turn. Activate only if you control three or more creatures with different powers.

Sunken Citadel enters the battlefield tapped. As it enters, choose a color.

: Add one mana of the chosen color.

: Add two mana of the chosen color. Spend this mana only to activate abilities of land sources.

At the beginning of each player's upkeep, that player returns a creature they control to its owner's hand.

: Add .

, : Add , , or .

Other Giant creatures you control get +2/+2 and have trample.

Flying

Whenever an opponent casts a spell, put a +1/+1 counter on Sunscorch Regent and you gain 1 life.

You may exile two white cards from your hand rather than pay this spell's mana cost.

Destroy all creatures.

Conjure a card named Suntail Hawk into your hand. If you have fewer than seven cards in hand, repeat this process.

Return target creature to its owner's hand. You create a token that's a copy of that creature.

Flying

Champion an Elemental (When this enters the battlefield, sacrifice it unless you exile another Elemental you control. When this leaves the battlefield, that card returns to the battlefield.)

Flying

Other Spirits you control get +1/+1.

Exile target instant or sorcery card from your graveyard. Creatures you control get +X/+0 until end of turn, where X is that card's mana value. Whenever a creature you control deals combat damage to a player this turn, copy the exiled card. You may cast the copy without paying its mana cost.

Whenever Surgespanner becomes tapped, you may pay . If you do, return target permanent to its owner's hand.

Whenever you discard a creature card, put a +1/+1 counter on Surly Badgersaur.

Whenever you discard a land card, create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

Whenever you discard a noncreature, nonland card, Surly Badgersaur fights up to one target creature you don't control.

Trample

Other creatures you control have trample.

Whenever another nontoken creature enters the battlefield under your control, put a +1/+1 counter on it. It gains haste until end of turn.

Whenever you cast an instant or sorcery spell, you may put a charge counter on Surrakar Spellblade.

Whenever Surrakar Spellblade deals combat damage to a player, you may draw X cards, where X is the number of charge counters on it.

Whenever Surtland Flinger attacks, you may sacrifice another creature. When you do, Surtland Flinger deals damage equal to the sacrificed creature's power to any target. If the sacrificed creature was a Giant, Surtland Flinger deals twice that much damage instead.

, Exile Surveyor's Scope: Search your library for up to X basic land cards, where X is the number of players who control at least two more lands than you. Put those cards onto the battlefield, then shuffle.

If you would planeswalk, instead look at the top two cards of your planar deck, put one on the bottom of your planar deck and the other on top, then planeswalk.

: Add .

Doctor's companion (You can have two commanders if the other is the Doctor.)

Suspicious Stowaway can't be blocked.

Whenever Suspicious Stowaway deals combat damage to a player, draw a card, then discard a card.

Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

Trample

As Sutured Ghoul enters the battlefield, exile any number of creature cards from your graveyard.

Sutured Ghoul's power is equal to the total power of the exiled cards and its toughness is equal to their total toughness.

Counter target enchantment, instant, or sorcery spell. Its controller creates a 2/2 blue Bird creature token with flying.

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

Swarm Shambler enters the battlefield with a +1/+1 counter on it.

Whenever a creature you control with a +1/+1 counter on it becomes the target of a spell an opponent controls, create a 1/1 green Insect creature token.

, : Put a +1/+1 counter on Swarm Shambler.

Each player shuffles their hand, graveyard, and all permanents they own into their library, then draws seven cards. Each player's life total becomes 7.

Sweltering Suns deals 3 damage to each creature.

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

Flash

Enchant creature or Vehicle

Enchanted permanent is a Vehicle artifact with crew 5 and it loses all other card types. (It's not a creature unless it's crewed.)

Exile target nontoken creature. Return it to the battlefield under its owner's control at the beginning of the next end step.

Whenever an opponent casts a spell from their hand, you may reveal the top card of your library. If it shares a card type with that spell, counter that spell and that opponent may cast the revealed card without paying its mana cost.

Visit — After the first combat phase this turn, there's an additional combat phase. At the beginning of that combat, untap all creatures that attacked this turn.

Lights — 4, 6

Flying, haste

Whenever Swooping Pteranodon or another Dinosaur with flying enters the battlefield under your control, gain control of target creature an opponent controls until end of turn. Untap that creature. It gains flying and haste until end of turn. At the beginning of the next end step, target land deals 3 damage to that creature.

Equipped creature gets +5/+5.

Whenever equipped creature deals damage to a creature, exile that creature. (Exile it only if it's still on the battlefield.)

Equip (: Attach to target creature you control. Equip only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if the creature leaves.)

Sword of the Ages enters the battlefield tapped.

, Sacrifice Sword of the Ages and any number of creatures you control: Sword of the Ages deals X damage to any target, where X is the total power of the creatures sacrificed this way, then exile Sword of the Ages and those creature cards.

: Target legendary creature gets +2/+2 until end of turn.

As long as equipped creature is tapped, tapped creatures you control get +2/+0.

As long as equipped creature is untapped, untapped creatures you control get +0/+2.

: You may tap or untap equipped creature.

Equip

Reveal the top three cards of your library. For each of those cards, put that card into your hand unless any opponent pays 3 life. Then exile the rest.

: Sworn Defender's power becomes the toughness of target creature blocking or being blocked by Sworn Defender minus 1 until end of turn, and Sworn Defender's toughness becomes 1 plus the power of that creature until end of turn.

At the beginning of each end step, if an opponent lost 3 or more life this turn, you may draw a card. (Damage causes loss of life.)

Vigilance

As long as you control six or more lands, Sylvan Advocate and land creatures you control get +2/+2.

Until your next turn, all lands you control become 2/2 Elemental creatures with reach, indestructible, and haste. They're still lands.

Defender, hexproof

: Add one mana of any color.

Choose an opponent. You and that player each create an X/X green Treefolk creature token.

Choose an opponent. You and that player each create X 1/1 green Elf Warrior creature tokens.

Sacrifice a land: Target creature you control gains shroud until end of turn. (It can't be the target of spells or abilities.)

Sylvan Yeti's power is equal to the number of cards in your hand.

Skip your draw step.

, Tap two untapped creatures you control: Draw a card.