msem-instigator

{T}: Add {C}.
{3}, {T}: Add {C} for each basic land you control.

Riga's Workshop enters the battlefield tapped.
When Riga's Workshop enters the battlefield, you may mill two cards.
{T}: Add {U} or {R}.

Riko's Academy enters the battlefield tapped.
When Riko's Academy enters the battlefield, you may mill two cards.
{T}: Add {R} or {W}.

Equipped creature has hexproof and can't be blocked.
Equip {1}
Whenever Ring of Souls becomes attached to a creature, an opponent of your choice may create a 2/2 black Spirit creature token.

Ripping Wilds enters the battlefield tapped.
{T}: Add {C}.
{2}, {T}, Sacrifice Ripping Wilds: You may put up to two basic land cards from your hand onto the battlefield tapped.

Ripplecore Trails enters the battlefield tapped.
{T}: Add {R} or {G}.
{R}{G}, {T}, Sacrifice Ripplecore Trails: Conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

Rippling Core enters the battlefield tapped.
{T}: Add {R} or {W}.
{R}{W}, {T}, Sacrifice Rippling Core: Conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

{T}: Add {C}.
{T}, Reappropriate: Add {W} or {U}. (Exile exactly two cards from your hand and/or graveyard.)

{T}: Add {C}.
{1}: Risti Workshop becomes a creature in addition to its other types until end of turn.
When Risti Workshop deals combat damage to an opponent, you may sacrifice it. If you do, search your library for a basic land card, put it onto the battlefield, then shuffle.

({T}: Add {U} or {R}.)
As Ritzy Parlor enters the battlefield, you may pay {1}. If you don't, Ritzy Parlor enters the battlefield tapped.

{T}, Pay 1 life: Add {W}.
{6}{W}{W}{W}, Exile Rius, Temple of the Grandfather from your hand: Target player gains 20 life.

Riv's Safehouse enters the battlefield tapped.
When Riv's Safehouse enters the battlefield, you may mill two cards.
{T}: Add {U} or {B}.

As long as your deck contains only blue and colorless cards, your minimum deck size is reduced by eight.

({T}: Add {U} or {R}.)
Roaring Cascade enters the battlefield tapped.

{T}: Add {C}.
{4}, {T}: Target creature can't be blocked this turn.

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 the battlefield tapped unless you control another Desert.
{T}: Add {B} or {G}.

({T}: Add {R}.)
Rousing Rubble enters the battlefield 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 the battlefield 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 the battlefield tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

Rugged Highlands enters the battlefield tapped.
When Rugged Highlands enters the battlefield, 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.