Cannot be Normal Summoned/Set. Must be Special Summoned with "Assault Mode Activate". You can reveal this card in your hand; add 1 "Assault Mode Activate" or 1 card that mentions it from your Deck to your hand, and if you do, shuffle this card into the Deck. You can only use this effect of "Crimson Blader/Assault Mode" once per turn. Your opponent cannot activate the effects of Level 5 or higher monsters Special Summoned from the Extra Deck. If this card is destroyed: You can Special Summon 1 "Crimson Blader" from your GY.