Glassworks // Shattered Yard

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. (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.)