msem-instigator

Vigilance, reach
When Winter Widow enters, you may destroy target creature with flying.

Deathtouch
Whenever another creature named Winter's Whelp you control enters, you draw a card and you lose 1 life.

Menace
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.)

Rapport — Whenever Witch's Apprentice and at least one other creature you control become tapped, Witch's Apprentice gets +1/+1 until end of turn, then scry 1.

Deathtouch
Whenever Withered Elk deals combat damage to a player, that player loses half their life, rounded down.

Equipped creature has indestructible as long as it's tapped.
Equip {3}

Trample
{5}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)

Whenever you cast a noncreature spell, look at the top X cards of your library, where X is that spell's mana value. Put those cards on top of your library in any order.

When Almgrove Librarian enters, look at the top card of each of your libraries, then for each of those cards, put it on the top or bottom of one of your libraries.

Flash
When Aokara Redeemer enters, exile another target permanent you control. Return that card to the battlefield under your control at the beginning of the next end step.

Whenever you cast a spell, draw a card if that spell has the same name as a card in your graveyard.

Create a 1/1 red and green Elemental creature token. Creatures you control get +1/+1 and gain haste until end of turn.
Orchestrate {R}{G} (You may exile this card from your hand anytime you could cast a sorcery for its orchestrate cost. When you next resolve a spell, you may cast this from exile without paying its mana cost.)

Haste
Whenever Arpechian Tiger attacks, you may sacrifice a land. If you do, Arpechian Tiger deals 3 damage to target creature or planeswalker.

Haste
{T}, Sacrifice a creature: Ashspeaker deals 1 damage to any target.

When you cast Aspect of Shifting Storms, create a token that's a copy of it.
You may have Aspect of Shifting Storms enter as a copy of any creature on the battlefield, except if it's a token it has no mana cost.

Menace
Whenever a creature you control deals combat damage to a permanent, that permanent's controller sacrifices it.

You may cast target instant card from your graveyard this turn. If a card cast this way would be put into your graveyard, exile it instead.

Target player discards a card. Return a creature card from your graveyard to your hand.

Up to two target creatures you control each get +2/+0 and gain first strike and haste until end of turn.
Orchestrate—Tap an untapped red and white creature you control or an untapped red creature you control and untapped white creature you control. (You may exile this card from your hand anytime you could cast a sorcery for its orchestrate cost. When you next resolve a spell, you may cast this from exile without paying its mana cost.)

Target player discards two cards.
Orchestrate {1}{B}{B} (You may exile this card from your hand anytime you could cast a sorcery for its orchestrate cost. When you next resolve a spell, you may cast this from exile without paying its mana cost.)

Target creature and all other creatures with the same name as that creature get +2/+0 until end of turn.

When Breaker of Secrets enters, each player mills three cards from each of their libraries.
Recite {U} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave the battlefield.)

Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)
Whenever you cast a spell, if its mana value is less than Cavorting Beauty's power, remove a +1/+1 counter from Cavorting Beauty.

Flash
When Ceaseless Valiant enters, another target permanent gains indestructible until end of turn.
Recite {1}{W} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave the battlefield.)

When Chiheisen, Terrace of Serenity enters, draw a card, then choose a creature card name.
Spells you cast with the chosen name cost {2} less to cast.