msem-instigator

When Wealthy Merchants enters, 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.)

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

{T}, Exert Weary Border Guard: Tap target creature. (An exerted creature won't untap during your next untap step.)

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, prevent all combat damage target creature would deal this turn.

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.)

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
When Weathered Veteran dies, you may put a -1/-1 counter on target creature.

Whenever Weave Etcher enters or equipped creature attacks, create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”
Equip {1}

Reach
Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)

Whenever Weaver of Lore attacks, you may reveal your hand. Weaver of Lore gets +2/+2 until end of turn if you reveal two or more blue cards this way.

Whenever an enchantment you control enters, target opponent loses 1 life and you gain 1 life.

Search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Augmented — If you've spent {W}{U}{B}{R}{G} to cast spells this turn, put four +1/+1 counters on up to one target creature you control.

If a source would deal damage to a creature this turn, prevent all but 1 of that damage.

When Weedy Wanderer leaves the battlefield or phases out, put a +1/+1 counter on a creature you control.

Menace (This creature can't be blocked except by two or more creatures.)
Whenever Weedy Whackers attacks, create a 1/1 green Insect creature token that's tapped and attacking.

When Weeping Yaoguai enters, create a 1/1 colorless Spirit creature token.
Scavenge {3}{B} ({3}{B}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Whenever you attack or block with one or more other creatures, Wehre-District Patrollers gets +1/+0 and gains first strike until end of turn.

Enchant creature
Enchanted creature gets +2/+2 as long as it's legendary. Otherwise, it can't attack or block.
When enchanted creature dies, if it's legendary, return that card to its owner's hand.

Enchant creature
Enchanted creature has flying.
{2}: Tap enchanted creature.

Put two +1/+1 counters on up to one target creature.
Coalesce {6}{G}{G} (You may cast this from your graveyard for {6}{G}{G}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)

Flying
Welkin Tern can block only creatures with flying.

Whenever West Ward Purifier becomes tapped, you gain 1 life.

Destroy target creature.
You gain 2 life.

Enchant permanent
Whenever enchanted permanent becomes untapped, its controller gets a poison counter.