Floowandereeze and the Dreaming Town

During the Main Phase: Immediately after this effect resolves, Normal Summon 1 Level 4 or lower Winged Beast monster. If you Tribute Summon a Level 7 or higher monster while this card is in your GY: You can banish this card; change all monsters your opponent controls to face-down Defense Position. You can only use this effect of "Floowandereeze and the Dreaming Town" once per turn.