At the beginning of each player's upkeep, if that player controls more lands than each other player, Rivalry deals 2 damage to them.

Menace

: Add two mana in any combination of colors. Spend this mana only to cast Dragon creature spells.

Once during each of your turns, you may cast a Dragon creature spell from your graveyard.

Whenever you cast a Dragon creature spell from your graveyard, it gains "When this creature dies, exile it."

Rivendell enters the battlefield tapped unless you control a legendary creature.

: Add .

, : Scry 2. Activate only if you control a legendary creature.

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

: Regenerate River Boa.

River Delta doesn't untap during your untap step if it has a depletion counter on it.

At the beginning of your upkeep, remove a depletion counter from River Delta.

: Add or . Put a depletion counter on River Delta.

When River Herald Scout enters the battlefield, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Flying

: You gain 2 life and draw a card.

Whenever River Kelpie or another permanent enters the battlefield from a graveyard, draw a card.

Whenever a player casts a spell from a graveyard, draw a card.

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.)

: Add . If you played a land this turn, add instead.

River Sneak can't be blocked.

Whenever another Merfolk enters the battlefield under your control, River Sneak gets +1/+1 until end of turn.

Imprint — Whenever a player casts an instant or sorcery spell from their hand, exile it instead of putting it into a graveyard as it resolves.

At the beginning of your upkeep, if there are four or more cards exiled with River Song's Diary, choose one of them at random. You may cast it without paying its mana cost.

: Add .

If was spent to cast this spell, return up to one target creature to its owner's hand. If was spent to cast this spell, target player reveals their hand, you choose a nonland card from it, then that player discards that card. (Do both if was spent.)

Flying

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever you sacrifice a creature, you may return target creature card with lesser mana value from your graveyard to the battlefield tapped. Do this only once each turn.

Choose three. You may choose the same mode more than once.

• You draw a card and you lose 1 life.

• Riveteers Confluence deals 1 damage to each creature and planeswalker you don't control.

• You may put a land card from your hand or graveyard onto the battlefield tapped.

: Riveteers Initiate gains deathtouch until end of turn.

Menace

When Riveteers Provocateur enters the battlefield, choose a creature card in your hand without blitz. It perpetually gains blitz. The blitz cost is equal to its mana cost.

Blitz (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)

When Riveting Rigger enters the battlefield, you may sacrifice another artifact. If you do, put two +1/+1 counters on Riveting Rigger and it assembles a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)

Spectacle (You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.)

When Rix Maadi Reveler enters the battlefield, discard a card, then draw a card. If Rix Maadi Reveler's spectacle cost was paid, instead discard your hand, then draw three cards.

Flying, trample

When Roalesk, Apex Hybrid enters the battlefield, put two +1/+1 counters on another target creature you control.

When Roalesk dies, proliferate, then proliferate again. (Choose any number of permanents and/or players, then give each another counter of each kind already there. Then do it again.)

At the beginning of your upkeep, return a creature you control to its owner's hand.

Vigilance

Robaran Mercenaries has all activated abilities of all legendary creatures you control.

Flying

You may exert Rohirrim Chargers as it attacks. (It won't untap during your next untap step.)

Whenever you exert a creature, reveal cards from the top of your library until you reveal an Equipment card. Put that card onto the battlefield attached to that creature, then put the rest on the bottom of your library in a random order.

Converge — Creatures your opponents control get -X/-0 until end of turn, where X is the number of colors of mana spent to cast this spell.

Draw a card.

Trample

Whenever a source deals damage to Rona, Tolarian Obliterator, that source's controller exiles a card from their hand at random. If it's a land card, you may put it onto the battlefield under your control. Otherwise, you may cast it without paying its mana cost.

, Return Rootha, Mercurial Artist to its owner's hand: Copy target instant or sorcery spell you control. You may choose new targets for the copy.

: Add .

, : Add one mana of any color.

Flying, haste

Menace

Whenever Rotisserie Elemental deals combat damage to a player, put a skewer counter on Rotisserie Elemental. Then you may sacrifice it. If you do, exile the top X cards of your library, where X is the number of skewer counters on Rotisserie Elemental. You may play those cards this turn.

+2: During target player's next turn, each creature that player controls attacks if able.

−2: Rowan Kenrith deals 3 damage to each tapped creature target player controls.

−8: Target player gets an emblem with "Whenever you activate an ability that isn't a mana ability, copy it. You may choose new targets for the copy."

Partner with Will Kenrith

Rowan Kenrith can be your commander.

When Rubblebelt Maverick enters the battlefield, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

, Exile Rubblebelt Maverick from your graveyard: Put a +1/+1 counter on target creature. Activate only as a sorcery.

Haste

Whenever Ruby, Daring Tracker 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 the battlefield tapped.

: Add . ( represents colorless mana.)

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

Flying

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

Kicker—Sacrifice a land. (You may sacrifice a land in addition to any other costs as you cast this spell.)

Return target nonland permanent to its owner's hand. If this spell was kicked, return another target nonland permanent to its owner's hand.

When Ruthless Lawbringer enters the battlefield, you may sacrifice another creature. When you do, destroy target nonland permanent.

Whenever Rysorian Badger attacks and isn't blocked, you may exile up to two target creature cards from defending player's graveyard. If you do, you gain 1 life for each card exiled this way and Rysorian Badger assigns no combat damage this turn.

Discard any number of cards. Creatures you control get +0/+1 until end of turn for each card discarded this way.

A person outside the game chooses an attacking or blocking creature target opponent controls. That player sacrifices that creature.

Search your library for a Forest or Plains card, reveal it, put it into your hand, then shuffle.

Constellation — Whenever an enchantment enters the battlefield under your control, target player mills two cards.

Enchant creature

When Sage's Reverie enters the battlefield, draw a card for each Aura you control that's attached to a creature.

Enchanted creature gets +1/+1 for each Aura you control that's attached to a creature.

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

, Sacrifice two artifacts: Draw a card.

: You may put a land card from your hand onto the battlefield.

Domain — : Prevent the next X damage that would be dealt to target creature this turn, where X is the number of basic land types among lands you control.

Lifelink

Discard a historic card: Sanctum Spirit gains indestructible until end of turn. (Artifacts, legendaries, and Sagas are historic.)