Duskmourn: House of Horror

Dazzling Theater // Prop Room | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) Creature spells you cast have convoke. (Your creatures can help cast those spells. Each creature you tap while casting a creature spell pays for {1} or one mana of that creature's color.) // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) Untap each creature you control during each other player's untap step. | Henry Peters

Dollmaker's Shop // Porcelain Gallery | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) Whenever one or more non-Toy creatures you control attack a player, create a 1/1 white Toy artifact creature token. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) Creatures you control have base power and toughness each equal to the number of creatures you control. | Chris Cold

Overlord of the Mistmoors | Enchantment Creature | Avatar Horror | Impending 4—{2}{W}{W} (If you cast this spell for its impending cost, it enters with four time counters and isn't a creature until the last is removed. At the beginning of your end step, remove a time counter from it.) Whenever Overlord of the Mistmoors enters or attacks, create two 2/1 white Insect creature tokens with flying. | Steven Belledin

Central Elevator // Promising Stairs | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, search your library for a Room card that doesn't have the same name as a Room you control, reveal it, put it into your hand, then shuffle. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) At the beginning of your upkeep, surveil 1. You win the game if there are eight or more different names among unlocked doors of Rooms you control. | Cristi Balanescu

Meat Locker // Drowned Diner | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, tap up to one target creature and put two stun counters on it. (If a permanent with a stun counter would become untapped, remove one from it instead.) // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, draw three cards, then discard a card. | Sergey Glushakov

Mirror Room // Fractured Realm | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, create a token that's a copy of target creature you control, except it's a Reflection in addition to its other creature types. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) If a triggered ability of a permanent you control triggers, that ability triggers an additional time. | Helge C. Balzer

Derelict Attic // Widow's Walk | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, you draw two cards and you lose 2 life. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) Whenever a creature you control attacks alone, it gets +1/+0 and gains deathtouch until end of turn. | Marc Simonetti

Funeral Room // Awakening Hall | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, return all creature cards from your graveyard to the battlefield. | Miklós Ligeti

Unholy Annex // Ritual Chamber | Enchantment // Enchantment | Room // Room | At the beginning of your end step, draw a card. If you control a Demon, each opponent loses 2 life and you gain 2 life. Otherwise, you lose 2 life. (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) // When you unlock this door, create a 6/6 black Demon creature token with flying. (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) | Matteo Bassini

Valgavoth, Terror Eater | Legendary Creature | Elder Demon | Flying, lifelink Ward—Sacrifice three nonland permanents. If a card you didn't control would be put into an opponent's graveyard from anywhere, exile it instead. During your turn, you may play cards exiled with Valgavoth. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost. | Antonio José Manzanedo

Vile Mutilator | Creature | Demon | As an additional cost to cast this spell, sacrifice a creature or enchantment. Flying, trample When Vile Mutilator enters, each opponent sacrifices a nontoken enchantment, then sacrifices a nontoken creature. | Néstor Ossandón Leal

Charred Foyer // Warped Space | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) At the beginning of your upkeep, exile the top card of your library. You may play that card this turn. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) Once each turn, you may pay {0} rather than pay the mana cost for a spell you cast from exile. | Andrew Mar

Glassworks // Shattered Yard | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, this Room deals 4 damage to target creature an opponent controls. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) At the beginning of your end step, this Room deals 1 damage to each opponent. | Sergey Glushakov

Ticket Booth // Tunnel of Hate | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, manifest dread. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) Whenever you attack, target attacking creature gains double strike until end of turn. | Marco Gorlei

Altanak, the Thrice-Called | Legendary Creature | Insect Beast | Trample Whenever Altanak, the Thrice-Called becomes the target of a spell or ability an opponent controls, draw a card. {1}{G}, Discard Altanak, the Thrice-Called: Return target land card from your graveyard to the battlefield tapped. | Sam Wolfe Connelly

Greenhouse // Rickety Gazebo | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) Lands you control have "{T}: Add one mana of any color." // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, mill four cards, then return up to two permanent cards from among them to your hand. | John Di Giovanni

Moldering Gym // Weight Room | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, search your library for a basic land card, put it onto the battlefield tapped, then shuffle. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, manifest dread, then put three +1/+1 counters on that creature. | Helge C. Balzer

Walk-In Closet // Forgotten Cellar | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) You may play lands from your graveyard. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, you may cast spells from your graveyard this turn, and if a card would be put into your graveyard from anywhere this turn, exile it instead. | Miklós Ligeti

Restricted Office // Lecture Hall | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, destroy all creatures with power 3 or greater. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) Other permanents you control have hexproof. | Antonio José Manzanedo

Shroudstomper | Creature | Elemental | Deathtouch Whenever Shroudstomper enters or attacks, each opponent loses 2 life. You gain 2 life and draw a card. | Campbell White

Roaring Furnace // Steaming Sauna | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, this Room deals damage equal to the number of cards in your hand to target creature an opponent controls. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) You have no maximum hand size. At the beginning of your end step, draw a card. | Miklós Ligeti

Smoky Lounge // Misty Salon | Enchantment // Enchantment | Room // Room | (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) At the beginning of your first main phase, add {R}{R}. Spend this mana only to cast Room spells and unlock doors. // (You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.) When you unlock this door, create an X/X blue Spirit creature token with flying, where X is the number of unlocked doors among Rooms you control. | Marco Gorlei