Cannot be destroyed by card effects. You can send 1 monster from your Deck to the GY; until the End Phase, the Attribute of all monsters you currently control become the Attribute of the sent monster. You can target 1 monster you control and reveal 1 "Grand Master" monster in your Extra Deck with the same Attribute as that target; this turn, if you would Link Summon using that target as Material, you can treat it as a Link-2 Link Monster. You must control a "Grand Master" monster to activate and resolve these effects. You can only use each effect of "Grand Master World" once per turn.