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.

Destroy target land, then Roiling Terrain deals damage to that land's controller equal to the number of land cards in that player's graveyard.

Return up to two target creatures your opponents control to their owners' hands. Target player draws two cards.

Roil's Retribution deals 5 damage divided as you choose among any number of target attacking or blocking creatures.

Visit — Creatures you control get +2/+0 until end of turn.

Lights — 2, 6

Visit — Creatures you control get +2/+0 until end of turn.

Lights — 4, 6

All creatures get +2/-2 until end of turn.

Destroy target land. If was spent to cast this spell, all creatures get -1/-1 until end of turn.

Rolling Temblor deals 2 damage to each creature without flying.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Vigilance

, : Create a tapped token that's a copy of target token that entered the battlefield this turn.

Doctor's companion (You can have two commanders if the other is the Doctor.)

Whenever you cast a legendary spell, untap Rona, Herald of Invasion.

: Draw a card, then discard a card.

: Transform Rona. Activate only as a sorcery. ( can be paid with either or 2 life.)

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.

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.)

Protection from snow

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Sacrifice Ronom Unicorn: Destroy target enchantment.

Flash

Flying, lifelink

When Rooftop Assassin enters the battlefield, destroy target creature an opponent controls that was dealt damage this turn.

Flying

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

Until end of turn, target creature gets +0/+2 and another target creature gets -2/-0.

Kicker (You may pay an additional as you cast this spell.)

When Roost of Drakes enters the battlefield, if it was kicked, create a 2/2 blue Drake creature token with flying.

Whenever you cast a kicked spell, create a 2/2 blue Drake creature token with flying.

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.

Artifacts and lands enter the battlefield tapped.

This spell can't be countered.

Sliver spells can't be countered.

Whenever Root Spider blocks, it gets +1/+0 and gains first strike until end of turn.

Rootbound Crag enters the battlefield tapped unless you control a Mountain or a Forest.

: Add or .

: Add one mana of any color.

: Add two mana of any one color. Spend this mana only to cast spells from your graveyard.

, , Exile Rootcoil Creeper: Return target card with flashback you own from exile to your hand.

, 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.

Enchant creature without flying

When Roots enters the battlefield, tap enchanted creature.

Enchanted creature doesn't untap during its controller's untap step.

Mill three cards, then return a land card or Elf card from your graveyard to your hand. If you can't, draw a card. (To mill a card, put the top card of your library into your graveyard.)

Sacrifice a Forest: Regenerate Rootwater Alligator.

: Add .

: Add or . Rootwater Depths doesn't untap during your next untap step.

: 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

When Rope Line Attendant enters the battlefield, creature cards in your hand perpetually gain "When this creature enters the battlefield, create a 1/1 green and white Citizen creature token."

Partner with Amy Pond

First strike, lifelink

The Last Centurion — When you cast this spell from anywhere other than exile, exile it with three time counters on it. It gains suspend. Then investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Rose Tyler gets +1/+1 for each time counter on it.

Bad Wolf — Whenever Rose Tyler attacks, put a time counter on it for each suspended card you own and each other permanent you control with a time counter on it.

Doctor's companion (You can have two commanders if the other is the Doctor.)

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 Rosethorn Halberd enters the battlefield, attach it to target non-Human creature you control.

Equipped creature gets +2/+1.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

When Rosie Cotton of South Lane enters the battlefield, create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")

Whenever you create a token, put a +1/+1 counter on target creature you control other than Rosie.

Whenever one or more creature cards leave your graveyard, Rot Farm Mortipede gets +1/+0 and gains menace and lifelink until end of turn.

Menace

When Rot Hulk enters the battlefield, return up to X target Zombie cards from your graveyard to the battlefield, where X is the number of opponents you have.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Whenever a creature dealt damage by Rot Wolf this turn dies, you may draw a card.

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.