Flying

Rimefeather Owl's power and toughness are each equal to the number of snow permanents on the battlefield.

: Put an ice counter on target permanent.

Permanents with ice counters on them are snow.

Flash

Defender

Robobrain War Mind's power is equal to the number of cards in your hand.

When Robobrain War Mind enters, you get an amount of (energy counters) equal to the number of artifact creatures you control.

Whenever Robobrain War Mind attacks, you may pay . If you do, draw a card.

Roc Hatchling enters with four shell counters on it.

At the beginning of your upkeep, remove a shell counter from Roc Hatchling.

As long as Roc Hatchling has no shell counters on it, it gets +3/+2 and has flying.

First strike, menace, trample

Partner (You can have two commanders if both have partner.)

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)

Heroic — Whenever you cast a spell that targets Rosnakht, Heir of Rohgahh, create a 0/1 red Kobold creature token named Kobolds of Kher Keep.

Flying

Roxi, Publicist to the Stars's power is equal to the number of permanents you control with an art sticker plus the number of cards in your graveyard with an art sticker.

When Roxi enters, distribute up to two art stickers among one or two nonland permanents you own.

Rubblehulk's power and toughness are each equal to the number of lands you control.

Bloodrush — , Discard Rubblehulk: Target attacking creature gets +X/+X until end of turn, where X is the number of lands you control.

When Rukh Egg dies, create a 4/4 red Bird creature token with flying at the beginning of the next end step.

Fading 5 <I>(This creature enters with five fade counters on it. At the beginning of your upkeep, remove a fade counter from it. If you can't, sacrifice it.)</I>

Rusting Golem's power and toughness are each equal to the number of fade counters on it.

Sage of Ancient Lore's power and toughness are each equal to the number of cards in your hand.

When Sage of Ancient Lore enters, draw a card.

At the beginning of each upkeep, if no spells were cast last turn, transform Sage of Ancient Lore.

: Add . Spend this mana only to cast a colorless spell or to activate an ability.

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

You may have Sakashima's Student enter as a copy of any creature on the battlefield, except it's a Ninja in addition to its other creature types.

Defender

, : Tap target creature. You may put a stun counter on it. If you do, put a stun counter on Sanctuary Wall. (If a permanent with a stun counter would become untapped, remove one from it instead.)

As long as it's your turn and you control four or more Mountains, Sardian Cliffstomper gets +X/+0, where X is the number of Mountains you control.

Trample

Savage Firecat enters with seven +1/+1 counters on it.

Whenever you tap a land for mana, remove a +1/+1 counter from Savage Firecat.

: Add . When you spend this mana to cast a Dragon creature spell, you gain 2 life.

Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.)

, Sacrifice this creature: Draw a card.

Kicker

When you cast this spell, if it was kicked, each player loses half their life, rounded up.

Scourge of the Skyclaves's power and toughness are each equal to 20 minus the highest life total among players.

Modular 2 (This creature enters with two +1/+1 counters on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

, Sacrifice an artifact: Search your library for a Construct card, reveal it, put it into your hand, then shuffle.

When you control no Islands, sacrifice Seasinger.

You may choose not to untap Seasinger during your untap step.

: Gain control of target creature whose controller controls an Island for as long as you control Seasinger and Seasinger remains tapped.

Sekki, Seasons' Guide enters with eight +1/+1 counters on it.

If damage would be dealt to Sekki, prevent that damage, remove that many +1/+1 counters from Sekki, and create that many 1/1 colorless Spirit creature tokens.

Sacrifice eight Spirits: Return Sekki from your graveyard to the battlefield.

Whenever Serene Master blocks, exchange its power and the power of target creature it's blocking until end of combat.

Serra Avatar's power and toughness are each equal to your life total.

When Serra Avatar is put into a graveyard from anywhere, shuffle it into its owner's library.

As Sewer Nemesis enters, choose a player.

Sewer Nemesis's power and toughness are each equal to the number of cards in the chosen player's graveyard.

Whenever the chosen player casts a spell, that player mills a card.

Shanna, Sisay's Legacy can't be the target of abilities your opponents control.

Shanna gets +1/+1 for each creature you control.

Reach

Sharpshooter Elf's power is equal to the number of creatures you control.

When Sharpshooter Elf enters, it deals damage equal to its power to target creature with flying an opponent controls.

Sheriff of Safe Passage enters with a +1/+1 counter on it plus an additional +1/+1 counter on it for each other creature you control.

Plot (You may pay and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)

Defender

Whenever Shield Sphere blocks, put a -0/-1 counter on it.

Defender (This creature can't attack.)

Shifting Wall enters with X +1/+1 counters on it.

Flying

Shinewend enters with a +1/+1 counter on it.

, Remove a +1/+1 counter from Shinewend: Destroy target enchantment.

Defender

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

, , Sacrifice Shore Keeper: Draw three cards.

: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

: You gain 1 life.

Flying, vigilance

Silverwing Squadron's power and toughness are each equal to the number of creatures you control.

Whenever Silverwing Squadron attacks, create a number of 2/2 white Knight creature tokens with vigilance equal to the number of opponents you have.

Graft 3 (This creature enters with three +1/+1 counters on it. Whenever another creature enters, you may move a +1/+1 counter from this creature onto it.)

: Until end of turn, target creature with a +1/+1 counter on it gains "Whenever this creature deals combat damage to a creature, destroy that creature at end of combat."

Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)

, Remove one or more +1/+1 counters from Simic Manipulator: Gain control of target creature with power less than or equal to the number of +1/+1 counters removed this way.

: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

As Six-y Beast enters, you secretly put six or fewer +1/+1 counters on it, then an opponent guesses the number of counters. If that player guesses right, sacrifice Six-y Beast after it enters.

When you control no Islands, sacrifice Skeleton Ship.

: Put a -1/-1 counter on target creature.

Flying

Converge — Skyrider Elf enters with a +1/+1 counter on it for each color of mana spent to cast it.

Slag Fiend's power and toughness are each equal to the number of artifact cards in all graveyards.

Slurrk, All-Ingesting enters with five +1/+1 counters on it.

Whenever Slurrk or another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on each creature you control that has a +1/+1 counter on it.

Partner (You can have two commanders if both have partner.)

Smoldering Stagecoach's power is equal to the number of instant and sorcery cards in your graveyard.

Whenever Smoldering Stagecoach attacks, the next instant spell and the next sorcery spell you cast this turn each have cascade.

Crew 2

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)

Snubhorn Sentry gets +3/+0 as long as you have the city's blessing.

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

: Double the number of +1/+1 counters on Solarion.

Flying

Soramaro, First to Dream's power and toughness are each equal to the number of cards in your hand.

, Return a land you control to its owner's hand: Draw a card.

Permanent cards in graveyards can't enter the battlefield.

Players can't cast noncreature spells from graveyards or exile.

Defender (This creature can't attack.)

Whenever Souls of the Faultless is dealt combat damage, you gain that much life and attacking player loses that much life.