Roiling Horror's power and toughness are each equal to your life total minus the life total of an opponent with the most life.

Suspend X—. X can't be 0. (Rather than cast this card from your hand, you may pay and exile it with X time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost. It has haste.)

Whenever a time counter is removed from Roiling Horror while it's exiled, target player loses 1 life and you gain 1 life.

When Rona, Disciple of Gix enters the battlefield, you may exile target historic card from your graveyard. (Artifacts, legendaries, and Sagas are historic.)

You may cast spells from among cards exiled with Rona.

, : Exile the top card of your library.

Whenever you cast an instant or sorcery spell, each opponent loses 1 life.

You may cast Rona, Sheoldred's Faithful from your graveyard by discarding two cards in addition to paying its other costs.

Bushido 2 (Whenever this creature blocks or becomes blocked, it gets +2/+2 until end of turn.)

Haste

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

Ronom Serpent can't attack unless defending player controls a snow land.

When you control no snow lands, sacrifice Ronom Serpent.

: Roofstalker Wight gains flying until end of turn.

Flying

Whenever Rooftop Saboteurs deals combat damage to a player or battle, draw a card.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

When Root Elemental is turned face up, you may put a creature card from your hand onto the battlefield.

This spell can't be countered.

Sliver spells can't be countered.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

, 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.

When Rooting Moloch enters the battlefield, exile target card with a cycling ability from your graveyard. Until the end of your next turn, you may play that card.

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

When Rootless Yew dies, search your library for a creature card with power or toughness 6 or greater, reveal it, put it into your hand, then shuffle.

: Add .

, : Add one mana of any color.

: Rootwalla gets +2/+2 until end of turn. Activate only once each turn.

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

: Rootwater Hunter deals 1 damage to any target.

: Look at the top card of target player's library.

: Rootwater Thief gains flying until end of turn.

Whenever Rootwater Thief deals combat damage to a player, you may pay . If you do, search that player's library for a card and exile it, then the player shuffles.

, Sacrifice Rootwire Amalgam: Create an X/X colorless Golem artifact creature token, where X is three times Rootwire Amalgam's power. It gains haste until end of turn. Activate only as a sorcery.

//PRT-Prototype_Mech//

Prototype (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)

2/3

Flying, haste

Alliance — Whenever another creature enters the battlefield under your control, create a Treasure token if this is the first or second time this ability has resolved this turn. Otherwise, you may pay . When you do, Rose Room Treasurer deals X damage to any target.

First strike

Raid — At end of combat on your turn, if you attacked this turn, create a Junk token for each opponent you attacked. (It's an artifact with ", Sacrifice this artifact: Exile the top card of your library. You may play that card this turn. Activate only as a sorcery.")

Whenever you sacrifice a Junk, add .

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

Other creatures you control are Assassins in addition to their other types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield.

Face-down creatures you control have menace.

Whenever a permanent you control is turned face up, you draw a card and you lose 1 life.

When Rosheen, Roaring Prophet enters the battlefield, mill six cards. You may put a card with in its mana cost from among them into your hand.

: Reveal any number of cards with in their mana cost in your hand. Add for each card revealed this way. Spend this mana only on costs that contain .

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.

Rot Farm Skeleton can't block.

, Mill four cards: Return Rot Farm Skeleton from your graveyard to the battlefield. Activate only as a sorcery.

Whenever another creature you control dies, put a +1/+1 counter on Rot Shambler.

When Rotcrown Ghoul dies, target player mills five cards.

When Rotfeaster Maggot enters the battlefield, exile target creature card from a graveyard. You gain life equal to that card's toughness.

Whenever Rotlung Reanimator or another Cleric dies, create a 2/2 black Zombie creature token.

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

When Rot-Tide Gargantua exploits a creature, each opponent sacrifices a creature.

Whenever Rotting Giant attacks or blocks, sacrifice it unless you exile a card from your graveyard.

At the beginning of your upkeep, discard a card.

Green creatures you control have trample.

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.

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.

When Rowan's Stalwarts enters the battlefield, you may search your library and/or graveyard for a card named Rowan, Fearless Sparkmage, reveal it, and put it into your hand. If you search your library this way, shuffle.

Whenever Roxanne, Starfall Savant enters the battlefield or attacks, create a tapped colorless artifact token named Meteorite with "When Meteorite enters the battlefield, 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.

: Destroy target tapped creature.

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

Phalanx Commander — When Royal Warden enters the battlefield, create two tapped 2/2 black Necron Warrior artifact creature tokens.

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.)

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

Whenever Rubblebelt Braggart attacks, if it's not suspected, you may suspect it. (A suspected creature has menace and can't block.)

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.

Rubblebelt Recluse attacks each combat if able.