Light Ray Monster, Rayviris

:When this unit is placed on by the ability of your vanguard with "Arkhite" in its card name, this unit gets ":When this unit attacks, 1, choose one of your opponent's vanguards, and it gets -5000 until end of turn." until end of turn. If your opponent's vanguard is grade 3 or greater, this unit gets +10000/ +1 until end of turn. :This unit cannot be chosen by your opponent's card effects.