msem-instigator

Target creature becomes the color or colors of your choice until end of turn.
Draw a card.

Destroy target creature or planeswalker. Create a tapped colorless land token named Fading Rift with “{T}, Sacrifice this land: Add one mana of any color.”

Reverberate {2} (When you cast this spell, copy it if you paid its reverberate cost.)
Draw a card.

Counter target spell. If a noncreature spell is countered this way, scry 2.

When R-12 Lone Digger enters, it deals 3 damage to target player or planeswalker.

When Rabudan Chiseler enters, you may search your library for an Aura or Equipment card, reveal it, put it into your hand, then shuffle.

Enchant creature
Enchanted creature gets +1/+2 and has flying.

When Radiant Rebuker enters, exile target nonland permanent an opponent controls until Radiant Rebuker leaves the battlefield.

Target creature gets +2/+2 until end of turn. If it's multicolored, it also gains indestructible until end of turn.

Radiant Vistas enters 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.”)

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)
Rafter Stalker can't be blocked by creatures with greater power.

Kicker {3} (You may pay an additional {3} as you cast this spell.)
Return target creature card from your graveyard to your hand. Then if this spell was kicked, return another target creature card from your graveyard to your hand.

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.

Target creature gets +2/+0 and gains trample and haste until end of turn.
Cycling {2} ({2}, Discard this card: Draw a card.)

When Raging Restitched enters, you may sacrifice a creature. When you do, Raging Restitched deals damage to target creature or planeswalker equal to the sacrificed creature's power.

Whenever Raging Warlord attacks, Goblins you control get +1/+0 until end of turn.

Flying
When Rahstahde Persecutor enters, you may pay {2}{R}. When you do, it deals 4 damage to target creature.

Flash
When Rahstahde Truthseeker enters, create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack, add a quest counter.
Tap target creature an opponent controls.
Create two 1/1 white Spirit creature tokens with flying.
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(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack, add a quest counter.
Create a Treasure token.
Create a tapped and attacking 5/5 red Dragon creature token with flying. Exile it at the beginning of the next end step.
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(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack, add a quest counter.
Mill two cards.
Return up to two target creature cards from your graveyard to your hand.
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(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack, add a quest counter.
Untap target creature or land you control.
Create two 2/2 green Wolf creature tokens.
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(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack, add a quest counter.
Scry 1.
Draw two cards.
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When Raikai Seafarer enters, you may search your library for up to three cards named Raikai Seafarer, reveal them, put them into your hand, then shuffle.

Create two 1/1 white Soldier creature tokens.