msem-instigator

At the beginning of your upkeep, you may pay {1}{G}. If you do, create a 1/1 green Dryad creature token with “Sacrifice this creature: Add one mana of any color.”

When Volaris Tideshaper enters, look at the top four cards of your library. Put one of those cards into your hand. and the rest on the bottom of your library in a random order.
Whenever you cast a noncreature spell, Volaris Tideshaper can't be blocked this turn.

Colossal 3—{7}{G} (You may cast this for its colossal cost to have it enter with three +1/+1 counters; or pay {7}{G} as a sorcery: Put three +1/+1 counters on it if it has none.)
When Voracious Asvosydna's colossal ability puts one or more counters on it, you gain 5 life.

Whenever Waketide Serpent attacks, you may pay {2}{U}. If you do, tap target creature. It doesn't untap during its controller's next untap step.

Defender
When Wall of Rime enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Defender
Whenever Wall of Sand deals combat damage to an opponent, you may pay 3 life. If you do, draw three cards.

Motivate 3 (When this creature enters, you may motivate target creature with lesser power than this by putting three +1/+1 counters on it.)
At the beginning of combat on your turn, you may have target creature you control gain vigilance until end of turn.

When Warden of Rehis-Dorahn enters, put a -1/-1 counter on each creature.
{2}{B}{G}, {T}: Destroy target creature with a counter on it.

Flying, vigilance
When Warden of Seas enters, tap all other creatures.
Each opponent can't untap more than one nonland permanent during each of their untap steps.

Flying
Morph {2}{W}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
When you turn Wardwing Seraph face up, untap it.

Trample
Warlord of Wun Su can't block alone.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)

Trample
Waste Grazer can't attack unless you've descended this turn. (You descended if a permanent card was put into your graveyard from anywhere this turn.)

Haste
When Wasteland Rabblerousers enters, creatures your opponents control with power X or less can't block this turn, where X is the number of Deserts you control.

Flying
Whenever a nontoken, noncreature, nonland permanent you control enters, create a token that's a copy of that permanent except it has no mana cost and it isn't legendary.

Flying
Cycling {2} ({2}, Discard this card: Draw a card.)

Trample, haste
When Weak-Spot Colossus is dealt exactly 1 damage, destroy it.

Vision (Whenever this or another creature you control enters, reveal the top card of your library. Then you may put that card into your graveyard.)
Whenever Weaver of the Winds envisions an instant or sorcery card, draw a card.

When Weizenmother enters, return target creature card with mana value 3 or less from your graveyard to the battlefield.
Plainscycling {2} ({2}, Discard this card: Search your library for a Plains card, reveal it, put it into your hand, then shuffle.)

Menace
Whenever Weoran enters or attacks, you may exile a creature card from your graveyard. If you do, draw a card. If that creature card had toughness 4 or greater, you gain 4 life.

Whenever a player casts an instant or sorcery spell, Wiedfree Roughrider deals 2 damage to that player.
Whenever Wiedfree Roughrider attacks, you may pay {X}. When you do, destroy target noncreature, nonland permanent with mana value X.

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

{2}{B}, Sacrifice another creature: Each opponent discards a card. Activate only during your turn.
When this creature dies, exile target card from a graveyard. You may play that card for as long as it remains exiled. If you cast a spell this way, pay life equal to its mana value rather than paying its mana cost.