msem-instigator

Flying, haste
Whenever Pyrus, the Undying Flame attacks, add {R}{R}{R}{R}. You don't lose this mana as steps, phases, and turns end.
{1}{R}: Pyrus gets +1/+0 until end of turn.

Qi-Long Shrine enters the battlefield tapped.
{T}: Add {U} or {R}.
{U/R}, {T}, Sacrifice Qi-Long Shrine: Put a +1/+1 counter on target creature you control. Activate only as a sorcery.

Equipped creature gets +2/+0.
Equipped creature has first strike as long as it's attacking.
Equip {2}

{T}: Add {C}.
{T}, Exile two cards from your graveyard: Add {G} or {U}.

{T}: Add {R} or {W}. You lose 1 life unless you have less life than an opponent.

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

Whenever you cast a noncreature spell, Rageborn Pyromancer gets +1/+1 until end of turn.
{1}{R}: Rageborn Pyromancer gets +1/+0 and gains flying until end of turn.

Raider's Den enters the battlefield tapped.
{T}: Add {R}.
{R}, {T}: Target creature you control gains menace until end of turn. Activate only as a sorcery and only if you control a red creature.

({T}: Add {G} or {U}.)
Rainforest Spring enters the battlefield tapped.

({T}: Add {W} or {U}.)
Rainsculpted Gorge enters the battlefield tapped.
{1}, {T}: Add {W}{W} or {U}{U}.

Raintouched Basin enters the battlefield tapped.
{T}: Add {U}.
Desertcycling {1}{U} ({1}{U}, Discard this card: Search your library for a Desert card, reveal it, and put it into your hand, then shuffle.)

Art of war — At the beginning of your end step, if Raiun Bay Junk dealt damage to an opponent this turn, put a +1/+1 counter on it.
Tap an untapped creature you control: Raiun Bay Junk becomes an artifact creature until end of turn.

Equipped creature gets +1/+1 for each Equipment attached to it.
Whenever an Equipment enters the battlefield under your control, attach it to equipped creature.
Equip {2}

Equipped creature has “Whenever this creature attacks, untap each other creature you control.”
Equip {3}

Ralora, Unforgiving Depths enters the battlefield tapped.
Whenever a source deals damage to you, put a creation counter on Ralora.
{T}, Remove ten creation counters from Ralora and sacrifice it: It deals 10 damage to target player or planeswalker.

({T}: Add {R} or {G}.)
Whenever Rampant Summit becomes tapped, you lose 1 life unless you control two or more basic lands.

Defender, reach
Bulwark — {X}, {T}: Rampart Ballista deals X damage to each opponent. X can't be greater than the number of creatures you control with toughness 4 or greater.

Ravaged Monument enters the battlefield tapped.
{T}: Add {G}.
{2/G}{2/G}: Ravaged Monument becomes a 4/4 green Elemental creature until end of turn. It's still a land.

Equipped creature is a Flagbearer in addition to its other types.
While an opponent is choosing targets as part of casting a spell they control or activating an ability they control, that player must choose at least one Flagbearer on the battlefield if able.
Equip {5}

Ravenous Hollow enters the battlefield tapped.
{T}: Add {B} or {R}.
{2}{B}{R}: Until end of turn, Ravenous Hollow becomes a Wolf creature with first strike in addition to its other types.
Scavenge {2}{B}{R}

You may return a land you control to its owner's hand rather than pay this spell's mana cost.
Rawthlin Market Line enters the battlefield tapped.
{T}: Add {G}.

{T}: Add {C}.
{2}, {T}: Target creature gains haste until end of turn.

Flying

{T}: Add {C}.
{T}, Reappropriate: Add one mana of any color. (To reappropriate, exile exactly two cards from your hand and/or graveyard.)

{T}: Add {C}.
{1}, {T}: Add one mana of any color. This ability costs {1} less to activate if there are three or more colors among cards in your graveyard.