msem-instigator

This spell can't be countered.
Tap up to three target permanents.
Coalesce {9}{U}{U} (You may cast this from your graveyard for {9}{U}{U}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
Opponents can't untap more than two permanents during their untap steps while Drown Amidst the Cosmos is on the battlefield.

[progress 2+]
[progress 5+]
Whenever a creature enters, each opponent loses 1 life.

{W}: Target creature gains vigilance until end of turn.

When you unveil Shining Elementalist, creatures can't block this turn.

Whenever one or more cards are put into your graveyard from your library, exile one of those cards.
Whenever Colossal Hermit deals combat damage to a player, you may cast a card exiled with it without paying its mana cost.

At the beginning of each player's upkeep, that player may sacrifice a creature. If they don't, they discard a card.

Flash
Enchant creature
Enchanted creature gets +3/+3.

Exile two cards from your graveyard: Petrified Guard becomes a 3/1 Zombie creature until end of turn.

Flash
Enchant creature
Enchanted creature gets -3/-0 and doesn't untap during its controller's untap step.

Heretic (Whenever you cast a spell that doesn't share a color with this creature, it gets +1/+1 until end of turn.)
When Shoring Naiad enters, if {U} was spent to cast it, you may return an instant or sorcery card from your graveyard to your hand.

Equipped creature gets +2/+2 and has protection from green and from white.
Whenever equipped creature deals combat damage to a player, you may reveal the top five cards of your library. Put a creature card revealed this way into your hand, then put the rest into your graveyard. Destroy up to one target enchantment.
Equip {2}

At the beginning of each end step, if you've cast a noncreature spell this turn, Void Sculptor deals 1 damage to each opponent.

When Adept of Rations enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
Tokens you control have “{2}, {T}, Sacrifice this token: You gain 3 life.”

Creatures with power 4 or greater can't attack or block unless their controller pays {2} for each of those creatures.

Sunrise Ruins enters tapped.
{T}: Add {B}.
You may untap Sunrise Ruins during each other player's untap step. Whenever you do, you lose 1 life.

When Life from Death enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
Whenever a nontoken creature you control dies, create a 1/1 green Saproling creature token.

Equipped creature gets +0/+4 and has vigilance and reach.
Equip {3}

Target creature you control gets +1/+2 until end of turn. It fights target creature you don't control.

At the beginning of combat on your turn, Ruination's Hand gains flying until end of turn if a creature you control or a creature card in your graveyard has flying. The same is true for first strike, double strike, deathtouch, hexproof, haste, indestructible, lifelink, menace, reach, trample, and vigilance.

Whenever you draw a card, put a +1/+1 counter on Ontarachie Dryad.
Remove a counter from Ontarachie Dryad: Create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”

As Protean Jar enters, choose a creature type.
Each creature you control of the chosen type enters with an additional +1/+1 counter on it.
{2}: If Protean Jar isn't a creature, it becomes a copy of target creature you control of the chosen type, except it has Protean Jar's other abilities. Activate only as a sorcery.

{4}{R}, Sacrifice Lavahurler: It deals 5 damage to target player or planeswalker.

Flying
When Reticent Possessor enters, you may attach target Aura you control to target permanent or player it could enchant.

As an additional cost to cast this spell, sacrifice a creature.
Create three 1/1 black Worm creature tokens.