This clever loop turns the room-manipulation mechanics of Marina Vendrell and Mirror Room // Fractured Realm into an engine for infinite token copies. With Fires of Yavimaya granting haste so your creatures can act immediately, Marina unlocks the room's duplication side, which is doubled by Fractured Realm's static ability to churn out two tokens of a haste-enabled Fatestitcher. From there, the Fatestitcher tokens use their untap ability to untap Marina, allowing you to continually lock and unlock the doors to flood the board with infinite creature enters-the-battlefield triggers and an endless army of tapped tokens.