msem-instigator

Trample, haste
Defiance (Whenever this creature takes damage, if it survives and wasn't defiant, put a +1/+1 counter on it and it becomes defiant.)
Whenever Wastewolf attacks, it deals 1 damage to any other target.

Whenever Wasting Soul attacks or blocks, sacrifice a creature, then put two +1/+1 counters on Wasting Soul.

Whenever Watch Me Burn enters or another source you control deals noncombat damage, put an ignition counter on Watch Me Burn. Then it deals damage equal to the number of ignition counters on it to each opponent.

Put target nonland permanent on top of its owner's library.

Target player mills two cards.
Draw a card.
Coalesce {6}{U} (You may cast this from your graveyard for {6}{U}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)

Creature tokens you control have vigilance.
Whenever Watch of the Dead or another enchantment you control enters, create a 2/2 black Zombie creature token.

{4}{B}{R}: Exile Watch the World Fade from your hand with seven apocalypse counters on it.
At the beginning of your upkeep, if Watch the World Fade is exiled, remove an apocalypse counter from it. If you do, each opponent loses 3 life unless they discard a card or sacrifice a nonland permanent. When you remove the last counter this way, each player loses the game.

Changeling (This card is every creature type.)
Watcher of the Polyps has all names of creature cards in addition to its name as long as it's on the battlefield.
Watcher of the Polyps gets +X/+X, where X is the greatest number of creatures you control with the same name.

Vigilance
Bulwark — {1}{W}, {T}: Create a 1/1 white Soldier creature token. Activate only if you control a creature with toughness 4 or greater.

Menace
Whenever one or more cards leave your graveyard or Watchers of the Veil leaves your graveyard, you may draw a card. If you do, discard a card.

Flying
{1}{W}, {T}: Tap target creature.

Flying

Vigilance
Whenever Watchful Navigator crews a Vehicle, that Vehicle gets +1/+1 and gains vigilance until end of turn.

Vigilance
Whenever you cast a noncreature spell, you gain 2 life.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Vigilance (Attacking doesn't cause this creature to tap.)

Whenever Watchkeeper Deserter attacks, discard up to two cards, then draw that many cards. Watchkeeper Deserter gets +X/+0 until end of turn, where X is the total mana value of the discarded cards.

Remove all -1/-1 counters from target creature. That creature gets +3/+3 and gains trample until end of turn.

Watchkeeper's Retort deals 2 damage to target creature 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.)

As an additional cost to cast this spell, discard a card.
Create three 1/1 red Soldier creature tokens with haste.

Whenever a creature in Water Sutra Daoshi's pack dies, return a creature card with lesser mana value than that creature from your graveyard to your hand. (Two or more creatures you control with equal power are in a pack.)

If you would gain life this turn, you gain twice that much life instead.
Draw a card.

Waterfront Market enters tapped unless you control a basic land.
{T}: Add {W} or {U}.

Each other creature you control that's a Merfolk or an Elemental gets +1/+1.
Whenever you cast an instant, sorcery, or Merfolk spell, you may pay {1}. If you do, create a 1/0 blue Elemental creature token.

Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
{3}{U}: Target creature gains slipstream until end of turn.

Spend only black mana on X.
Up to two target creatures each get -X/-X until end of turn. You gain X life.