Room is a new enchantment type. Room cards are similar to split cards, but with a major fundamental difference: they're permanent cards. Each Room card has two halves, called "doors." Pick one half to cast, and that door unlocks on the battlefield, giving you access to that half's abilities. Pay mana to unlock the other door later and get access to everything! Abilities that trigger "when you unlock this door" will trigger either way.

On Duskmourn, your worst nightmares come to life. That's not a metaphor, by the way; they're real, and they're dangerous. Mechanically, this takes the form of the manifest dread keyword action, which lets you choose one of two cards to put face down on the battlefield. If it's a creature card, you can turn it face up later to terrorize your opponents.

We've all had that moment where we just know something's not right. It's a little off. It's a bit … eerie. Is that good or bad? Well, that depends on who you are. The eerie ability word signals abilities that trigger whenever an enchantment enters under your control and whenever you fully unlock a Room.

The Duskmourn release includes a cycle of ten dual lands that enter tapped unless a player has 13 or less life.