If a face-up card you control leaves the field by your card effect, or to activate the effect of your card, and the card that left the field was "Stardust Dragon" or a Synchro Monster that mentioned it: You can apply 1 of the following effects, but you cannot apply that same effect of "Majestic Mirage" again this turn. ● Special Summon 1 of those monsters. ● Banish 1 monster from your opponent's field or GY. ● Any damage you take this turn is halved.