Rotating Fireplace enters tapped with a time counter on it.

: Add an amount of equal to the number of time counters on Rotating Fireplace.

, : Time travel. Activate only as a sorcery. (For each suspended card you own and each permanent you control with a time counter on it, you may add or remove a time counter.)

When Rotting Rats enters, each player discards a card.

Unearth (: 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.)

Defender

: Roving Keep gets +2/+0 and gains trample until end of turn. It can attack this turn as though it didn't have defender.

+1: Up to one target creature gets +3/+0 and gains first strike until end of turn.

−2: Rowan, Fearless Sparkmage deals 1 damage to each of up to two target creatures. Those creatures can't block this turn.

−9: Gain control of all creatures until end of turn. Untap them. They gain haste until end of turn.

Menace

: Spells you cast this turn that are black and/or red cost less to cast, where X is the amount of life you lost this turn. Activate only as a sorcery.

Whenever Roxanne, Starfall Savant enters or attacks, create a tapped colorless artifact token named Meteorite with "When Meteorite enters, it deals 2 damage to any target" and ": Add one mana of any color."

Whenever you tap an artifact token for mana, add one mana of any type that artifact token produced.

, Exile the top card of your library: You gain 1 life.

Bloodrush — , Discard Rubblebelt Maaka: Target attacking creature gets +3/+3 until end of turn.

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.

Haste (This creature can attack and as soon as it comes under your control.)

Whenever Ruby attacks while you control a creature with power 4 or greater, Ruby gets +2/+2 until end of turn.

: Add or .

: Add .

, : Add , , or .

Menace

When Ruin Grinder dies, each player may discard their hand and draw seven cards.

Mountaincycling (, Discard this card: Search your library for a Mountain card, reveal it, put it into your hand, then shuffle.)

Ruins of Oran-Rief enters tapped.

: Add . ( represents colorless mana.)

: Put a +1/+1 counter on target colorless creature that entered this turn.

Reach, deathtouch

: Put a +1/+1 counter on Ruins Recluse.

At the beginning of your upkeep, you may put a verse counter on Rumbling Crescendo.

, Sacrifice Rumbling Crescendo: Destroy up to X target lands, where X is the number of verse counters on Rumbling Crescendo.

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

Whenever you cast a creature spell with mana value 5 or greater, that creature enters with X additional +1/+1 counters on it, where X is its mana value minus 4.

Creatures you control with three or more +1/+1 counters on them have haste.

: Add .

Whenever you cast a red spell, if Runaway Steam-Kin has fewer than three +1/+1 counters on it, put a +1/+1 counter on Runaway Steam-Kin.

Remove three +1/+1 counters from Runaway Steam-Kin: Add .

: The next time a black source of your choice would deal damage to you this turn, prevent that damage.

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

: The next time a green source of your choice would deal damage to you this turn, prevent that damage.

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

: The next time a red source of your choice would deal damage to you this turn, prevent that damage.

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

, : Runebound Wolf deals damage equal to the number of Wolves and Werewolves you control to target opponent.

Flying

: Rune-Cervin Rider gets +1/+1 until end of turn.

Flying

, Exile Runehorn Hellkite from your graveyard: Each player discards their hand, then draws seven cards.

, : Target attacking creature gets +2/+0 until end of turn. When that creature leaves the battlefield this turn, sacrifice Runesword. If the creature deals damage to a creature this turn, the creature dealt damage can't be regenerated this turn. If a creature dealt damage by the targeted creature would die this turn, exile that creature instead.

Rushwood Grove enters tapped.

: Put a storage counter on Rushwood Grove.

, Remove any number of storage counters from Rushwood Grove: Add for each storage counter removed this way.

First strike

Sacrifice an artifact: Rust Monster gets +2/+0 until end of turn.

Sacrifice an artifact: Regenerate Rusted Slasher.

Rustvale Bridge enters tapped.

Indestructible

: Add or .

, Sacrifice a creature: Create two Treasure tokens. (They're artifacts with ", Sacrifice this artifact: Add one mana of any color.")

Sacrifice three Treasures: Draw a card.

, : Look at the top card of target player's library. If it has an Agents of S.N.E.A.K. watermark, you may reveal it and put it into your hand. Otherwise, put it on your choice of the top or bottom of its owner's library.

Sabertooth Alley Cat attacks each combat if able.

: Creatures without defender can't block Sabertooth Alley Cat this turn.

: Reveal any number of creature cards with power 5 or greater from your hand. Add for each card revealed this way.

: Target creature gets +1/+0 until end of turn.

(: Add or .)

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

At the beginning of your upkeep, sacrifice Sacred Mesa unless you sacrifice a Pegasus.

: Create a 1/1 white Pegasus creature token with flying.

, : You gain 4 life. Activate only if you control a Yanggu planeswalker.

Enchant creature

Enchanted creature has ", : Put a -1/-1 counter on target creature."

: Prevent all combat damage that would be dealt by target creature this turn.

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

Heroic — Whenever you cast a spell that targets Sage of Hours, put a +1/+1 counter on it.

Remove all +1/+1 counters from Sage of Hours: For each five counters removed this way, take an extra turn after this one.

: 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.

+1: Scry 1. Saheeli Rai deals 1 damage to each opponent.

−2: Create a token that's a copy of target artifact or creature you control, except it's an artifact in addition to its other types. That token gains haste. Exile it at the beginning of the next end step.

−7: Search your library for up to three artifact cards with different names, put them onto the battlefield, then shuffle.

Whenever you cast a noncreature spell, create a 1/1 colorless Servo artifact creature token.

−2: Target artifact you control becomes a copy of another target artifact or creature you control until end of turn, except it's an artifact in addition to its other types.

, : Create a token that's a copy of another target creature or artifact you control, except it's an artifact in addition to its other types. It gains haste. Sacrifice it at the beginning of the next end step.

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

, Sacrifice two artifacts: Draw a card.

: Target creature gains flying until end of turn. Any player may activate this ability.

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."

Sacrifice Sakura-Tribe Elder: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

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.")