msem-instigator

Whenever you gain life, put a +1/+1 counter on Wayfaring Pilgrim.

When Wayfaring Realmstitcher enters the battlefield, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

When Wayfaring Swindler enters the battlefield, destroy all permanents attached to target creature.

Target creature gets +2/+2 until end of turn.
Wanderlust — If you control four or more differently named lands, that creature gets +4/+4 until end of turn instead.

{T}: Add {C}. Spend this mana only to cast a creature spell.
{T}, Sacrifice Waypoint Stone: Choose target creature card in your graveyard that was put there from the battlefield this turn. Return it to your hand.

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

When Wayward Bloodseeker enters the battlefield, put a +1/+1 counter on up to one target creature you control. When you do, Wayward Bloodseeker deals damage to any target equal to the number of permanents you control with counters on them.

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

As Wayward Wanderers enters, you may have it become X/X with ward {X} and “Other creatures you control have base power and toughness X/X.”
{1}{G}: Return Wayward Wanderers to its owner's hand.

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

Bleed {2}{R} (You may cast this spell for its bleed cost if an opponent has lost life this turn.)
Target player loses 2 life. If this spell's bleed cost was paid, it deals 1 damage to each creature that player controls.

When Weald Sentry enters the battlefield, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
When Weald Sentry dies, draw a card.

When Weald Wanderer enters the battlefield, you gain 3 life and each opponent loses 2 life.
{1}, Pay 1 life: Shuffle Weald Wanderer into its owner's library. If you do, draw a card.

Create an 8/8 blue Kraken creature token.
{2}{U}, Discard Wealth of the Flood: Create a Treasure token. Scry 2.

Mill five cards, then return up to one permanent card from your graveyard to your hand.

When Wealthy Merchants enters the battlefield, create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Destroy target artifact.
Cycling {1}{R} ({1}{R}, Discard this card: Draw a card.)

Until end of turn, target noncreature, non-Equipment artifact becomes an Equipment with equip X and “Equipped creature gets +X/+0”, where X is that artifact's mana value.

When Weary Adventurer enters the battlefield, return a permanent you control to its owner's hand.

Haste
Whenever Weary Sentinel attacks, you may pay {2}{R}{W}. If you do, it gets +2/+0 and gains first strike until end of turn.

Flash (You may cast this spell any time you could cast an instant.)
Defender
When Weary Steward enters the battlefield, prevent all combat damage target creature would deal this turn.

{2}{R}: Creatures you control get +1/+0 until end of turn.
{1}{G}: Creatures you control gain trample until end of turn.

Creatures you control get +0/+2 and gain hexproof until end of turn.

Weathered Fortress enters the battlefield tapped.
{T}: Add {U} or {R}.
{U}{R}: Until end of turn, Frozen Hinterlands becomes a 1/4 blue and red Golem creature with with “When this creature attacks, switch its power and toughness until end of turn” and “Whenever this creature attacks or blocks, torment yourself.” It's still a land. (To torment yourself, lose 3 life unless you discard a card or sacrifice a nonland permanent.)

Whenever Weathered Skiff attacks, it gets +1/+1 until end of turn.
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Ship Vehicle becomes an artifact creature until end of turn.)