Your opponent cannot target "Blue-Eyes White Dragon" in your Monster Zone with card effects. If this face-up card is sent from the Spell & Trap Zone to the GY: Destroy all monsters you control. You can only use the following effect of "True Light" once per turn. You can activate 1 of these effects;
●Special Summon 1 "Blue-Eyes White Dragon" from your hand or GY.
●Set 1 Spell/Trap from your Deck, that mentions "Blue-Eyes White Dragon", with a different name from the cards you control and in your GY.