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 directly from your Deck, that specifically lists Blue-Eyes White Dragon in its text, with a different name from the cards you control and in your GY.