msem-instigator

Destroy all monocolored creatures.

Return target creature you own to your hand.
Scry 1.

When Refuse Trawler enters, you may pay {G}. If you do, choose one —
• Return a permanent card from your graveyard to your hand.
• Rediscover a permanent card. (Look at the top card of your library. You may reveal it and put it into your hand if it's a permanent card. Otherwise, put it back or into your graveyard.)

Refuse to Submit deals 3 damage to any target. If that target is an attacking creature, it deals 5 damage instead.

Counter target spell.
{1}{U}, Exile Refute from your graveyard: Draw a card.

First strike, trample
Whenever Regal Coralhorn deals combat damage to a player or planeswalker, return target card with a cycling ability from your graveyard to your hand.
Cycling {2} ({2}, Discard this card: Draw a card.)

Menace
Regal Dragoon gets +1/+1 as long as you control a legendary creature.

Each player sacrifices three lands. Regal Ignition deals 3 damage to each nonlegendary creature.

Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
As long as you control three or more artifacts, Regal Seasnake has vigilance. (Attacking doesn't cause it to tap.)

Instant and sorcery spells you cast cost {1} less to cast.
Whenever you cast an instant or sorcery spell, Regrets of Mortals gets +2/+0 until end of turn. You may discard a card. If you do, draw a card.

Return target permanent card from your graveyard to your hand. If it's an enchantment card, create a 2/2 black Zombie creature token.

Legacy (You may play this side of this card only from your graveyard. Exile it if it would leave the battlefield or not resolve.)
At the beginning of your upkeep, you may return a creature card from your graveyard to your hand. If you do, you gain 2 life.

Menace

At the beginning of combat on your turn, you may have Regurgitator Ooze consume. If you do, it gets +2/+2 until end of turn. (To consume, sacrifice another creature or exile a creature card from your graveyard.)
When Regurgitator Ooze dies, return a card exiled with it to its owner's hand.

When Reha, Entropy's Call enters, you may search your library for any number of land cards with different names and exile them with harvest counters, then shuffle.
At the beginning of your upkeep, you may put a card that you own in exile with a harvest counter on it at random onto the battlefield tapped.

Choose two —
• You gain 3 life.
• Tap target creature.
• Put a +1/+1 counter on target creature.

Trample
{1}{B}: Rehis-Dorahn Plowbeast gets +1/+1 until end of turn.

Choose one—
• Put two -1/-1 counters on target creature.
• Untap target creature. It gains deathtouch until end of turn.
• Until end of turn, target creature deals damage to creatures in the form of -1/-1 counters.

Deathtouch

Rehison Soothemage has lifelink as long as you control another Elf.

If one or more -1/-1 counters would be put on a creature an opponent controls, put twice that many -1/-1 counters on it instead.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Reveal the top two cards of your library. Put up to one land card from among them onto the battlefield and the rest into your graveyard.
III — Until end of turn, target creature gets +X/+0 and gains indestructible, where X is the number of lands you control.

Whenever a creature dealt damage by Rei's Betrayer this turn dies, you gain life equal to that creature's toughness.

When Rei's Cultivator enters, create a green Aura enchantment token named Sowing Spring attached to target land. The token has enchant land, “Enchanted land's name is Flowering Expanse” and “Whenever enchanted land is tapped for mana, add one mana of any color.”

Reach
{2}{G}: Rei's Ranger gets +2/+0 until end of turn.