When you unlock this door, this Room deals 2 damage to target creature.

X can't be 0.
Draw X cards. Create an X/X black Demon creature token with flying. Your life total becomes X. You can't gain life for the rest of the game.

Haste
Whenever one or more other creatures die, Soul Shredder perpetually gets +1/+1. This ability also triggers if Soul Shredder is in your graveyard.
Crew 1
, Sacrifice two creatures: Return Soul Shredder from your graveyard to the battlefield. Activate only as a sorcery.

Enchantment spells you cast have convoke.
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, conjure a card named Mothlight Processionist into your hand. Discard that card at the beginning of the next end step.

As long as Chittering Illuminator is at the top of your library, you may look at it any time and you may cast it.
As long as the top card of your library is a creature card, you may look at it any time and you may cast it.

Flying
When Wingbright Thief enters, target opponent reveals each nonland card in their hand. You choose one of them. That card perpetually gains "When you cast this spell, each opponent draws a card and gains 3 life."

Once during each of your turns, you may cast a noncreature, non-Aura permanent spell from your graveyard. If you do, it perpetually becomes a 2/1 Rat creature in addition to its other types.

Survival — At the beginning of your second main phase, if Improvising Aerialist is tapped, Improvising Aerialist and the top creature card in your library without flying perpetually gain flying.

Discard a card. If you do, seek two cards that don't share a card type with the discarded card.

Whenever Verdant Dread or another permanent you control named Verdant Dread enters, manifest dread.
: Conjure a card named Verdant Dread onto the battlefield. Activate only as a sorcery.

Manifest dread. Then each face-down creature you control gains "This permanent costs less to turn face up" and "When this permanent is turned face up, if it's a creature, put a +1/+1 counter on it."

Flying, lifelink
Whenever you gain life, a random creature card in your hand perpetually gets +X/+X, where X is the amount of life you gained.

When this creature enters or dies, exile another creature you control. If you do, conjure a duplicate of a random creature card with mana value X onto the battlefield, where X is 2 plus the exiled creature's mana value.

Each opponent sacrifices a nontoken creature. For each creature sacrificed this way, conjure a duplicate of it into your graveyard.

Survival — At the beginning of your second main phase, if Glimmer Hoarder is tapped, you lose 1 life and draft a card from Glimmer Hoarder's spellbook. That card perpetually becomes an enchantment in addition to its other types.

Creatures you control get +1/+0.

Ward—Pay 3 life.
Whenever this creature attacks, heist target opponent's library.

Whenever Gilded Ambusher attacks, you may sacrifice another nonland permanent. When you do, each opponent exiles a nonland, nontoken permanent they control and a random nonland card from their library, then Gilded Ambusher deals damage to them equal to the total mana value of the cards exiled this way.

When you cast this spell, target opponent drafts a card from Razor Demon's spellbook. They may cast that card without paying its mana cost.
Flying
Ward—Discard a card.

Double team
Whenever you cast an instant or sorcery spell, creatures you control that are Otters and/or enchantments get +1/+1 until end of turn.
When Enduring Friendship dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment. (It's not a creature.)

When Eager Flameguide enters, add . Spend this mana only to cast creature spells.
When Eager Flameguide dies, exile the top two cards of your library. Until the end of your next turn, you may cast creature spells from among the exiled cards.

Enchantment creatures you control have menace.
Whenever one or more enchantment creatures you control deal combat damage to a player, exile a random creature card from that player's library. Create a token that's a copy of that card, except it's a 1/1 enchantment creature.

Flying
When Mangled Soulrager enters, switch the power and toughness of each creature on the battlefield. You get a twelve-time boon with "Whenever a creature you control enters, switch its power and toughness."
Cycling

Haste
Whenever this creature enters or attacks, target creature you control perpetually gets +1/+0.
If a creature you control becoming the target of a spell or ability causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Enlist
Survival — At the beginning of your second main phase, if Effie is tapped, put a +1/+1 counter on each tapped creature you control. Then seek a Survivor card with mana value less than or equal to the number of tapped creatures you control.

When Ethrimik enters, manifest dread.
Other creatures you control get +1/+1.
As long as you control another creature, Ethrimik can't attack or block.

If you weren't the starting player, this spell costs less to cast.
Manifest dread.
Rebound

Wary Zone Guard enters tapped.
Survival — At the beginning of your second main phase, if Wary Zone Guard is tapped, return up to one target land card from your graveyard to the battlefield. Wary Zone Guard perpetually gets +1/+1.

Exile target creature. The exiled card perpetually becomes an enchantment. At the beginning of your next end step, put it onto the battlefield under your control. (It loses all other card types.)

Impending 3—
Whenever Lurker in the Deep enters or attacks, seek a nonland card.
Whenever you seek one or more cards during your turn, conjure a duplicate of each of those cards into your hand, then manifest those duplicates.