msem-instigator

Target player sacrifices a creature or planeswalker.
Leitmotif (If you cast this spell from your hand, exile it as it resolves. When you next cast a spell that shares a color with this card, you may cast this from exile without paying its mana cost.)

Engorge (As this enters, mill three cards, then exile a card from among the milled cards.)
When Risen Looter enters, if it engorged a noncreature, nonland card, draw a card, then discard a card.

When P-3 Ambusher enters, you may sacrifice a creature or discard a creature card. If you do, draw a card.

Whenever a creature you control deals combat damage to a player, you may sacrifice it. If you do, draw cards equal to that creature's power.

Menace, ward {2}
Whenever Envoy of Divine Progress deals combat damage to a player, you may search your library for an enchantment card, reveal it, put it into your hand, then shuffle.

When Mining Rover Manager enters, create a 1/1 colorless Servo artifact creature token.

Trample, hexproof
Renown 4 (When this creature deals combat damage to a player, if it isn't renowned, put four +1/+1 counters on it and it becomes renowned.)
{1}{G}: Target creature blocks Tsolmon, the Huntress this turn if able.

First strike
When Gavis's Dragoons enters, exile another target creature until Gavis's Dragoons leaves the battlefield.
Spells with the same name as the exiled card can't be cast (as long as this creature is on the battlefield).

Creatures you control lose poisonous and can't have or gain poisonous.
Snakes you control deal damage to players in the form of poison counters.

Sacrifice a creature: Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Target player discards two cards unless they discard a noncreature, nonland card.

Cleave deals 1 damage to each opponent and 1 damage to each creature and planeswalker your opponents control.

Exile target creature or planeswalker, then for each counter on that permanent, you may put a counter of that kind on a permanent you control.

When Russet Denmother enters, choose one —
• Destroy target enchantment.
• Create a 2/1 red and white Fox creature token.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
You can't lose the game and your opponents can't win the game.
I — Your life total becomes 1.
II — Double your life total.
III — Create an X/X white Avatar creature token with indestructible, where X is your life total.

{T}: Add {C}.
{1}: Tomb of Shifting Sands becomes a copy of target land card in any graveyard, except it has this ability and it's a Desert in addition to its other types. (This effect lasts indefinitely.)

When Forserval enters, creatures you control get +1/+1 and gain haste until end of turn.

[+1]: Remove up to one loyalty counter from each other planeswalker. Up to one target player loses 1 life for each counter removed this way.
[–1]: For each other player and permanent, remove a counter from it or give it another counter of a kind that permanent or player already has.
[–4]: Put target nonland permanent on the bottom of its owner's library.

Wild Pyromancy deals 2 damage to each creature, player, and planeswalker. If you cast this spell during your main phase, Wild Pyromancy deals 3 damage to each creature, player, and planeswalker instead.

Whenever Ferris, the Sapphire Storm or another creature you control enters, each opponent mills X cards, where X is that creature's power.

Creature spells you cast cost {1} less to cast.

Whenever you cast a noncreature spell, if you control exactly one creature, copy that spell. You may choose new targets for the copies. (If it's a permanent, it resolves as a token.)

Deathtouch

Discard your hand, shuffle your library, then draw three cards. You may cast a nonland card from your hand without paying its mana cost.
Acquiesce (If you cast this spell from your hand, exile it as it resolves. When one or more creatures you control deal combat damage to an opponent, you may cast this card from exile without paying its mana cost.)

Target player sacrifices a creature. You gain life equal to that creature's toughness.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)