msem-instigator

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.

When Witch's Invitation enters, you may put a -1/-1 counter on target creature.
{2}, {T}: Tap target creature with a -1/-1 counter on it.

First strike, hexproof

This spell costs {1} less to cast if you have more life than an opponent and {1} less to cast if you control a Cleric.
Deathtouch

Bleed {U/B} (You may cast this spell for its bleed cost if an opponent has lost life this turn.)
Target player mills eight cards.

When Withering Beggar dies, you may put a -1/-1 counter on target creature.

Trample
Vanishing 3 (This creature enters with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)

Choose one—
• Each opponent sacrifices a creature.
• Each opponent discards two cards.

Enchant creature
Enchanted creature gets +1/+0 for each card type among cards in your graveyard and has menace.
Fleeting {B} (You may cast this spell for its fleeting cost. If you do, sacrifice it at the beginning of the next end step.)

Whenever you cast a noncreature spell, you may pay {1}. If you do, scry 2. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

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.

Whenever you cast a spell, you may pay {1}. If you do, Wizened Tortle 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.)

{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.)

When Woken Wave dies, you may exile it. If you do, return target card from your graveyard to the battlefield face down.

When Wolfbriar Sapling enters, if you control seven or more lands, create a 2/2 green Wolf creature token.

When Wondering Oaf dies, return target instant or sorcery card from your graveyard to your hand.

{T}: Add {C}.
{3}, {T}: Create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

When Woodcutter's Hatchet enters, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Equipped creature gets +2/+2.
Equip {2}

Untap target creature you control. It gets +1/+4 and gains hexproof and reach until end of turn.

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.)

When Woopip Bruiser enters, germinate. When you do, you may have target non-Fungus creature get -X/-X until end of turn, where X is the greatest power among creatures you control. (To germinate, put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)

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.)