msem-instigator

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.

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

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.

Reach
{G}, Sacrifice Rei's Watch: Untap all creatures you control.

Rei, the Supplanter gets +1/+1 for each Forest you control.
At the beginning of each player's end step, if that player didn't play a land this turn, create a Forest token.

Reinbreaker Behemoth attacks each combat if able.

When Reincarnation Savant dies, manifest the bottom card of your library. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Flash
When Reinforced Platemail enters, you may attach it to target creature you control.
Equipped creature you control gets +1/+2.
Equip {3}

Harmony — Destroy target artifact or enchantment.
When Rejoicing Aristocrats enters, harmonize. (Trigger up to one harmony of one permanent you control.)

Trample, haste
When Rejuvenating Elemental enters, remove up to X -1/-1 counters from among creatures you control. Rejuvenating Elemental gets +1/+1 until end of turn for each counter removed this way.

When Relearn History enters, draw two cards.
You have no maximum hand size.

When Relentless Pathcutter enters, create a green Aura enchantment token named Enmity attached to target creature. The token has enchant creature and “Enchanted creature gets +2/+0 and has trample.”
When Relentless Pathcutter dies, return it to its owner's hand.

Flying
Foresight — Whenever you draw your second card each turn, Relentless Sphinx deals 2 damage to any target and you gain 2 life.

When Relentless Toqui enters, put two +1/+1 counters on a creature you control.
Creatures you control with counters on them have haste and menace.

Relic Hoarder gets +1/+0 for each artifact and/or enchantment you control.
Relic Hoarder has first strike as long as you control three or more artifacts and/or enchantments.

Deploy 3 (As this enters, you may tap any number of other creatures you control with total power 3 or more.)
When Relief Battalion enters deployed, draw a card.

Whenever another creature you control enters, you may upgrade Relitian Renegade. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Ward {2}
• Flying
• Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)