msem-instigator

Improve {1} ({1}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
Other creatures you control have improve {1}.

Menace
Whenever Wightclaw deals combat damage to a player, that player discards a card and you draw a card.

Whenever you cast a noncreature spell, Wild Pyromancer gets +1/+1 until end of turn.
Whenever Wild Pyromancer attacks, you may pay {2}{R}. If you do, transform Wild Pyromancer.

Haste
Ride {R} ({R}: Transform this and attach it to target creature you control without a Steed. Ride only as a sorcery.)

{B}, {T}: Destroy target tapped creature.

{1}, Sacrifice another creature: Wildborn Swindler deals 1 damage to target player or planeswalker. Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)
{1}, Discard a card at random: Wildborn Swindler deals 1 damage to you. Draw a card.

{3}: Wildwood Keeper gets +3/+2 until end of turn. Activate only once each turn.

Flying
{U}, Sacrifice Willow Spirit: Counter target spell or ability that targets you or a creature you control.

Flying
{0}: Willowing Wisp becomes the color of your choice until end of turn.

Deathtouch

Flying
Whenever Wind Savant attacks, harmonize. (Trigger up to one harmony of a permanent you control.)
Harmony — Wind Savant gets +1/+1 until end of turn.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
When Winding Snake has three or more +1/+1 counters on it, remove them all and transform it.

Flying
When Windwielder enters, you may return target Inscription card from your graveyard to your hand.

Flying
{3}{W}: Scry 2. You gain 2 life.

Flying
Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Flying
Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
As long as Wings of Trust has three or more +1/+1 counters on it, it has lifelink and vigilance.

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

Deathtouch
At the beginning of your end step, create a 1/1 black Rat creature token with “This creature can't block.”
{1}{B}, {T}, Sacrifice three other creatures: Each opponent discards a card and loses 2 life. You draw a card and gain 2 life.

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.

First strike, hexproof

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

When Wizened Calligrapher enters, you may search your library for an instant or sorcery card, reveal it, then shuffle and put that card on top of it.

{T}: Tap target creature. Activate only if Wizened Veteran is embattled. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

Harmony — Germinate. (Put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)
When Woopip Chef enters, harmonize. (Trigger up to one harmony of one permanent you control.)

Vigilance
Whenever a creature you control survives damage, it explores. (Reveal the top card of your library. Put it into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then you may put that card in your graveyard.)