Dazzling Theater // Prop Room #3

(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.) Dazzling Theater 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.) / Prop Room Untap each creature you control during each other player's untap step.