Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Vigilance

When Referee Squad enters, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Whenever you cast an instant or sorcery spell that targets only Reflective Golem, you may pay . If you do, copy that spell. You may choose new targets for the copy.

All Sliver creatures have haste.

Affinity for artifacts (This spell costs less to cast for each artifact you control.)

Flying

When Refurbished Familiar enters, each opponent discards a card. For each opponent who can't, you draw a card.

Flying

At the beginning of each end step, if you gained life this turn, create a 1/1 black Bat creature token with flying.

Other Cats you control get +1/+1 and have lifelink.

When Regal Caracal enters, create two 1/1 white Cat creature tokens with lifelink.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)

Whenever this creature mutates, other creatures you control get +2/+1 until end of turn.

Other Dinosaurs you control have haste.

When Regisaur Alpha enters, create a 3/3 green Dinosaur creature token with trample.

Flying, vigilance

Snow lands your opponents control enter tapped.

Noncreature spells your opponents cast with mana value 4 or greater cost more to cast.

Haste

At the beginning of your end step, return Reinforced Ronin to its owner's hand.

Channel — , Discard Reinforced Ronin: Draw a card.

Flying

When Reiver Demon enters, if you cast it from your hand, destroy all nonartifact, nonblack creatures. They can't be regenerated.

Flying

When Rekindling Phoenix dies, create a 0/1 red Elemental creature token with "At the beginning of your upkeep, sacrifice this creature and return target card named Rekindling Phoenix from your graveyard to the battlefield. It gains haste until end of turn."

: Relentless Hunter gets +1/+1 and gains trample until end of turn.

Relentless Rats gets +1/+1 for each other creature on the battlefield named Relentless Rats.

A deck can have any number of cards named Relentless Rats.

As an additional cost to cast this spell, exile a creature card from your graveyard.

Undying (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.)

Haste

Whenever Relic Robber deals combat damage to a player, that player creates a 0/1 colorless Goblin Construct artifact creature token with "This creature can't block" and "At the beginning of your upkeep, this creature deals 1 damage to you."

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)

When Relic Seeker becomes renowned, you may search your library for an Equipment card, reveal it, put it into your hand, then shuffle.

When Relief Captain enters, support 3. (Put a +1/+1 counter on each of up to three other target creatures.)

Survival — At the beginning of your second main phase, if Reluctant Role Model is tapped, put a flying, lifelink, or +1/+1 counter on it.

Whenever Reluctant Role Model or another creature you control dies, if it had counters on it, put those counters on up to one target creature.

Flying

Whenever another creature you control enters, you may pay . When you do, put X +1/+1 counters on that creature.

As long as you control five or more modified creatures, Remnant of the Rising Star gets +5/+5 and has trample. (Equipment, Auras you control, and counters are modifications.)

You may cast Dragon spells and artifact spells as though they had flash.

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

Wither (This deals damage to creatures in the form of -1/-1 counters.)

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.)

As long as you control a Chandra planeswalker, Renegade Firebrand gets +1/+0 and has first strike. (It deals combat damage before creatures without first strike.)

Revolt — When Renegade Rallier enters, if a permanent you controlled left the battlefield this turn, return target permanent card with mana value 2 or less from your graveyard to the battlefield.

At the beginning of your end step, goad up to one target creature you don't control and put a +1/+1 counter on Renegade Silent. Renegade Silent phases out. (Treat it and anything attached to it as though they don't exist until your next turn.)

First strike

Whenever Renegade Warlord attacks, each other attacking creature gets +1/+0 until end of turn.

: Add . Spend this mana only to cast artifact spells or activate abilities of artifacts.

, : Search your library for a card named Heart-Piercer Bow or Vial of Dragonfire, reveal it, put it into your hand, then shuffle.

: If Repeat Offender is suspected, put a +1/+1 counter on it. Otherwise, suspect it. (A suspected creature has menace and can't block.)

Flying

Whenever a creature dealt damage by Repentant Vampire this turn dies, put a +1/+1 counter on Repentant Vampire.

Threshold — As long as seven or more cards are in your graveyard, Repentant Vampire is white and has ": Destroy target black creature."

Exploit (When this creature enters, you may sacrifice a creature.)

When Repository Skaab exploits a creature, return target instant or sorcery card from your graveyard to your hand.

Flying

Whenever another non-Spirit creature you control dies, create a 1/1 white Spirit creature token with flying.

Exile target creature you control, then return that card to the battlefield under its owner's control. (Then exile this card. You may cast the creature later from exile.)

Flying

As Rescuer Sphinx enters, you may return a nonland permanent you control to its owner's hand. If you do, Rescuer Sphinx enters with a +1/+1 counter on it.

Flash

Flying

Whenever an artifact creature you control deals combat damage to a player, draw a card.

When Reservoir Walker enters, you gain 3 life and get (three energy counters).

Haste, protection from Coyotes

: Resilient Roadrunner can't be blocked this turn except by creatures with haste.

Sacrifice Resistance Fighter: Prevent all combat damage target creature would deal this turn.

When Resistance Squad enters, if you control another Human, draw a card.

Rally — Whenever Resolute Blademaster or another Ally you control enters, creatures you control gain double strike until end of turn.

: Resolute Rider gains lifelink until end of turn.

: Resolute Rider gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Trample

Whenever you roll your third die each turn, put a +1/+1 counter on Resolute Veggiesaur.

Flying

When Resonance Technician enters, you may discard a card. If you do, investigate twice.

, Tap X untapped artifacts you control: Copy target instant or sorcery spell you control with mana value X. You may choose new targets for the copy.

Flying

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

Whenever Resplendent Griffin attacks, if you have the city's blessing, put a +1/+1 counter on it.

White creatures you control have ": You gain 1 life."

At the beginning of your end step, if you gained life this turn, create a Blood token. (It's an artifact with ", , Discard a card, Sacrifice this artifact: Draw a card.")

Sacrifice two Blood tokens: Transform Restless Bloodseeker. Activate only as a sorcery.

: Regenerate Restless Dead.

When Restoration Gearsmith enters, return target artifact or creature card from your graveyard to your hand.

Delirium — : Return Resurrected Cultist from your graveyard to the battlefield with a finality counter on it. Activate only if there are four or more card types among cards in your graveyard and only as a sorcery. (If a creature with a finality counter on it would die, exile it instead.)