Twilight Ninja Nichirin, the Chunin

[ Warrior / Effect ] Once per turn, during either player's turn: You can discard 1 "Ninja" monster, then activate 1 of these effects; ● This turn, "Ninja" monsters and "Ninjitsu Art" cards you control cannot be destroyed by battle or card effects. ● 1 "Ninja" monster you control gains 1000 ATK until the end of this turn. ATK/ 2300 DEF/ 1000