First strike

Other Snake creatures you control get +0/+1.

Shamans you control have ": Add ."

Prevent the next 3 damage that would be dealt to target creature this turn. At the beginning of the next end step, put a +0/+1 counter on that creature for each 1 damage prevented this way.

(: Add or .)

As Sacred Foundry enters, you may pay 2 life. If you don't, it enters tapped.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Sacrifice a creature: Target player discards two cards. Activate only as a sorcery.

Menace

At the beginning of your end step, if you have the initiative, create a Treasure token. Create three of those tokens instead if you've completed a dungeon.

Choose a Background (You can have a Background as a second commander.)

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Sacrifice Saffi Eriksdotter: When target creature is put into your graveyard this turn, return that card to the battlefield.

When Sage of Days enters, look at the top three cards of your library. You may put one of those cards back on top of your library. Put the rest into your graveyard.

Each other Wizard creature you control enters with an additional +1/+1 counter on it.

, Remove a +1/+1 counter from a creature you control: Draw a card.

, Sacrifice an artifact: Draw a card.

When Sage of Shaila's Claim enters, you get (three energy counters).

Whenever Sage of the Falls or another non-Human creature you control enters, you may draw a card. If you do, discard a card.

: Add two mana in any combination of colors.

: Until end of turn, target land you control becomes an X/X Citizen creature with haste in addition to its other types, where X is twice the number of Gates you control. Activate only as a sorcery.

Tap an untapped Gate you control: Untap Sage of the Maze.

Flying

When Sage Owl enters, look at the top four cards of your library, then put them back in any order.

Return target sorcery card from your graveyard to your hand.

Whenever another blue creature you control enters, target player mills two cards.

Destroy target creature with flying. Sagittars' Volley deals 1 damage to each creature with flying your opponents control.

Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying.

, Sacrifice two artifacts: Draw a card.

Flash

This spell costs less to cast if there are no instant or sorcery cards in your hand.

When Saiba Syphoner enters the battlefield, return target instant or sorcery card from your graveyard to your hand.

If Saiba Syphoner would die, shuffle it into your library instead.

Will of the council — Starting with you, each player votes for return or embark. If return gets more votes, each player returns up to two cards from their graveyard to their hand, then you exile Sail into the West. If embark gets more votes or the vote is tied, each player may discard their hand and draw seven cards.

When Sailor of Means enters, create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

Whenever Saint Traft and Rem Karolus becomes tapped, create a 1/1 red Human creature token if this is the first time this ability has resolved this turn. If it's the second time, create a 1/1 blue Spirit creature token with flying. If it's the third time, create a 4/4 white Angel creature token with flying.

Whenever you cast a spell that has convoke, untap Saint Traft and Rem Karolus.

You may have Sakashima the Impostor enter as a copy of any creature on the battlefield, except its name is Sakashima the Impostor, it's legendary in addition to its other types, and it has ": Return this creature to its owner's hand at the beginning of the next end step."

Whenever a creature you control deals combat damage to a player, add that much . Until end of turn, you don't lose this mana as steps and phases end.

You may cast creature spells as though they had flash.

Whenever one or more other creatures you control leave the battlefield, investigate. This ability triggers only once each turn. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Outlast (, : Put a +1/+1 counter on this creature. Outlast only as a sorcery.)

Devoid (This card has no color.)

Ingest (Whenever this creature deals combat damage to a player, that player exiles the top card of their library.)

When Salvage Drone dies, you may draw a card. If you do, discard a card.

: Add one mana of any color. Activate only once each turn.

When Salvager of Secrets enters, return target instant or sorcery card from your graveyard to your hand.

Flying, vigilance, trample

Whenever you attack, other creatures you control get +2/+2 and gain indestructible until end of turn.

Unearth—Pay eight . (Pay eight energy counters: 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.)

Partner with Frodo, Adventurous Hobbit (When this creature enters, target player may put Frodo into their hand from their library, then shuffle.)

At the beginning of combat on your turn, create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")

Activated abilities of Foods you control cost less to activate.

Whenever Sample Collector attacks, you may collect evidence 3. When you do, put a +1/+1 counter on target creature you control. (To collect evidence 3, exile cards with total mana value 3 or greater from your graveyard.)

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)

If a permanent would be put into a graveyard, exile it instead.

Flash

Double strike, vigilance, haste

Other creatures you control have haste.

, : Untap another target creature.

Whenever another creature you control enters, Sanctifier of Souls gets +1/+1 until end of turn.

, Exile a creature card from your graveyard: Create a 1/1 white Spirit creature token with flying.

Humans you control get +1/+1.

, Tap two untapped Humans you control: Tap target creature an opponent controls.

: Prevent the next 2 damage that would be dealt to any target this turn.

At the beginning of your upkeep, you may search your library and/or graveyard for a Shrine card and put it onto the battlefield. If you search your library this way, shuffle.

If an ability of another Shrine you control triggers while you control six or more Shrines, that ability triggers an additional time.

: Add .

, : Return target commander you own from the battlefield to your hand. Activate only during your turn.

, Discard a land card or Shrine card: Sanctum of Shattered Heights deals X damage to target creature or planeswalker, where X is the number of Shrines you control.

(Transforms from Azor's Gateway.)

: Add X mana of any one color, where X is your life total.

: Add .

Whenever you cast a colorless spell with mana value 7 or greater, you may sacrifice Sanctum of Ugin. If you do, search your library for a colorless creature card, reveal it, put it into your hand, then shuffle.

Scry 1, then draw a card. (Then exile this card. You may cast the creature later from exile.)

When Sand Scout enters, if an opponent controls more lands than you, search your library for a Desert card, put it onto the battlefield tapped, then shuffle.

Whenever one or more land cards are put into your graveyard from anywhere, create a 1/1 red, green, and white Sand Warrior creature token. This ability triggers only once each turn.

, : Target creature gains islandwalk until end of turn. When that creature dies this turn, destroy Sandals of Abdallah. (A creature with islandwalk can't be blocked as long as defending player controls an Island.)

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

Each player skips their untap step.

At the beginning of each player's upkeep, that player simultaneously untaps each tapped artifact, creature, and land they control and taps each untapped artifact, creature, and land they control.

Flash

When Sandstalker Moloch enters, if an opponent cast a blue and/or black spell this turn, look at the top four cards of your library. You may reveal a permanent card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.