msem-instigator

Trample
Arpechian Champion can only attack or block alone.
Whenever a land you control enters, put a +1/+1 counter on Arpechian Champion.

Reach, trample
If a +1/+1 counter would be put on another creature you control, instead put a +1/+1 counter on that creature and on Avatar of the Natural.

Whenever another creature you control dies, put a +1/+1 counter on Deathfeeder.
Sacrifice Deathfeeder: Target creature gets +X/+X until end of turn, where X is Deathfeeder's power.

Put a +1/+1 counter on target creature.
Flashback {1}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

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.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
Whenever a card leaves your graveyard, you gain 1 life.
I, II — Return target land card from your graveyard to the battlefield.
III — Return any number of creature and/or land cards from your graveyard to your hand. Exile Restoration.

Once each turn, when another creature you control enters, you may search your library for a card with the same name as that creature, reveal it, put it into your hand, then shuffle.

Enchant land
Enchanted land's name is Flowering Expanse.
Whenever enchanted land is tapped for mana, add one mana of any color.

Whenever a creature you control becomes the target of a spell, that creature gets +3/+3 until end of turn.

Whenever you cast a nongreen spell, creatures you control get +1/+1 until end of turn.
Wanderlust — When Untethered Disciple enters, if you control four or more differently named lands, create two 1/1 Scout creature tokens that are all colors.

Draw X cards, then abound. (To abound, you may cast a spell that costs less than this from your hand without paying its mana cost.)

Whenever you create one or more tokens, put a rift counter on Destabilizing the Rifts.
As long as Destabilizing the Rifts has seven or more rift counters on it, creature tokens you control can't leave the battlefield.

Whenever one or more +1/+1 counters are put on a creature you control, you may search your library for a creature card, reveal it, put it into your hand, then shuffle.

Target creature you control deals damage equal to its power to target player or planeswalker.
Inscribe {4}{R}{G} ({4}{R}{G}: Exile this card from your hand inscribed on a creature you control. Whenever that creature attacks, its controller may cast a copy of the inscribed card without paying its mana cost. Inscribe only as a sorcery.)

[+1]: Reveal the top card of your library and put that card into your hand. You lose life equal to its mana value.
[+1]: Until end of turn, Lucien, the Grifter becomes a legendary 3/3 black and red Human Warrior creature with deathtouch, lifelink, and indestructible.
[–3]: Exile target artifact or creature. You gain life equal to its mana value.

When Mausoleum Suffragan enters, create a white and black Aura enchantment token named Pale Shroud attached to target creature. The token has enchant creature and “Enchanted creature gets +1/+1 and has lifelink.”
Whenever an artifact or enchantment you control enters, each opponent loses 1 life.

Discard your hand, then draw three cards.
Mindstorm's Eye deals 3 damage to any target.

Haste
Whenever Quinn or another creature you control enters, tap all creatures your opponents control.

Lifelink
Whenever Repent, Daughter of Fallacy blocks or becomes blocked, it deals 3 damage to any target.

Whenever you sacrifice a permanent, you may pay {1}. If you do, you draw a card and you gain 1 life.

Each creature gets -X/-X until end of turn. Destroy each artifact and enchantment with mana value X or less.

Each player shuffles their hand and each non-Revelation card from their graveyard into their library, then draws seven cards. You may put any number of land cards from your hand onto the battlefield.
Coalesce {6}{G}{U}{U} (You may cast this from your graveyard for {6}{G}{U}{U}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)

If one or more counters would be put on a permanent you control, you may have that many counters plus one or that many counters minus one put on that permanent instead.

Each player mills three cards.
Draw a card.

Target creature gets +3/+1 and gains trample until end of turn.