msem-instigator

Whenever Wakeborne Kraken or another Kraken, Leviathan, Octopus, or Serpent you control enters, you may return target creature an opponent controls to its owner's hand.
Whenever a creature an opponent controls leaves the battlefield, if it didn't die, draw a card.

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.

Prevent all combat damage that would be dealt by non-Spirit creatures this turn.

Deathtouch
When Waking Pollution enters, you may move all counters from target permanent onto Waking Pollution.

At the beginning of your upkeep, each player discards a card.
Whenever Waking Watcher attacks, if defending player has no cards in hand, it gets +3/+3 and gains menace until end of turn.

Glitch {1} (Remove one [restriction] for each time you pay the glitch cost.)
Target creature gains hexproof [from abilities] until end of turn and can't be blocked [by creatures with greater power than it] this turn.

Exile target nonland permanent. Create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Enchant creature
Enchanted creature can't block or be blocked.
{U}: Enchanted creature gets +1/+0 or -1/-0 until end of turn.

Search your library for a basic land card or a Forest card, reveal it, and put it into your hand, then shuffle.
Ferocious — Put the revealed card onto the battlefield instead if you control a creature with power 4 or greater.

Vigilance
Other Scouts you control get +1/+1 and have vigilance.
{X}, Tap four untapped Scouts you control: Create an X/X green Beast creature token.

Walker of the Final Path gets +3/+3 and has trample as long as you control a Horror.
When Walker of the Final Path enters, search your library for a Revelation card, put it into your graveyard, then shuffle.

When Walking Armory enters, return all Equipment cards from your graveyard to the battlefield, then attach them to Walking Armory.

{2}, Sacrifice Walking Platform: Create a 1/1 colorless Thopter artifact creature token with flying.

Lifelink
Whenever Walking Remorse or another creature dies, Walking Remorse deals 1 damage to target player or planeswalker.

Play with the top card of your library revealed.
Spells you cast that share a creature type with the top card of your library cost {1} less to cast.

Defender (This creature can't attack.)
Mirage {0} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Defender (This creature can't attack.)
Whenever Wall of Hope is dealt damage, you gain that much life.

Defender
When Wall of Ivy enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)

Defender
Whenever one or more creatures you control deal combat damage to a player, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
When Wall of Notes dies, draw a card.

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.

Defender
Whenever Wall of Seclusion blocks a creature, that creature doesn't untap during its controller's next untap step.

{T}, Pay 1 life: Add {B} or {G}.
{2}, {T}, Sacrifice Walled Garden and another permanent: Draw a card. Activate only during your turn.

Defender, reach

Angels, Demons, Faeries, and Spirits you control get +1/+1.
{2}{W}{B}, Pay 1 life, Discard a card: Create a tapped 1/1 white Spirit creature token with flying.