msem-instigator

Rosegill Rover can't be blocked.
Whenever Rosegill Rover attacks, you may discard a card. If you do, draw a card.

Rot-Sand Ruins enters tapped unless you control another Desert.
{T}: Add {B} or {G}.

Rousing Path enters tapped unless you control one or fewer other lands.
{T}: Add {U} or {R}.
Cycling {2} ({2}, Discard this card: Draw a card.)

({T}: Add {R}.)
Rousing Rubble enters tapped.
Double strike
{2}{R}{R}: Rousing Rubble becomes a creature in addition to its other types until end of turn.

{T}: Add {C}.
{2}, {T}: Add three mana of any one color.
{3}, {T}: Create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”

{T}, Pay 1 life: Add {W} or {B}.
{2}, {T}, Sacrifice Royal Hospital and another permanent: Draw a card. Activate only during your turn.

({T}: Add {R}, {G}, or {W}.)
Rugged Dominion enters tapped.

{T}: Add {C}.
{2}, {T}, Sacrifice Rugged Expanse: Put a +1/+1 counter on target creature. It gains vigilance until end of turn. Activate only as a sorcery.

({T}: Add {R} or {W}.)
Rugged Fields enters tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

Rugged Highlands enters tapped.
When Rugged Highlands enters, you gain 1 life.
{T}: Add {R} or {G}.

{T}, Sacrifice Ruined Citadel: Search your library for a Mountain or Plains card and put it onto the battlefield tapped, then shuffle.

{T}: Add {C}.
{T}: Add {C} for each six cards in your graveyard.

{T}: Add {C}.
{T}, Pay 1 life: Add {B} or {R}.

({T}: Add {B} or {R}.)
Ruined Shrine enters tapped unless you control two or more basic lands.

{T}: Add {C}.
{1}, {T}: Transform Ruined Theater.

{T}: Add {C}.
{4}, {T}: Look at the top two cards of your library. You may put one of them into your graveyard. Put the rest back on top in any order. If you control eight or more lands, draw a card.

Rupture Spire enters tapped.
When Rupture Spire enters, sacrifice it unless you pay {1}.
{T}: Add one mana of any color.

({T}: Add {R} or {W}.)
As Ruptured Citadel enters, you may pay {1}. If you don't, Ruptured Citadel enters tapped.

({T}: Add {W} or {B}.)
As Ruptured Expanse enters, you may pay {1}. If you don't, Ruptured Expanse enters tapped.

({T}: Add {U} or {R}.)
As Ruptured Falls enters, you may pay {1}. If you don't, Ruptured Falls enters tapped.

({T}: Add {B} or {R}.)
As Ruptured Flats enters, you may pay {1}. If you don't, Ruptured Flats enters tapped.

({T}: Add {U} or {B}.)
As Ruptured Grotto enters, you may pay {1}. If you don't, Ruptured Grotto enters tapped.

({T}: Add {G} or {U}.)
As Ruptured Grove enters, you may pay {1}. If you don't, Ruptured Grove enters tapped.

({T}: Add {G} or {W}.)
As Ruptured Meadow enters, you may pay {1}. If you don't, Ruptured Meadow enters tapped.

({T}: Add {B} or {G}.)
As Ruptured Morass enters, you may pay {1}. If you don't, Ruptured Morass enters tapped.