Armed Dragon Lightning

If an "Armed Dragon" monster(s) you control would be destroyed by card effect, you can send this card to the GY instead. You can target 1 "Armed Dragon" monster you control, then activate 1 of these effects;
● It gains ATK equal to its Level x 100 (even if this card leaves the field).
● Add 1 "Armed Dragon" monster with an equal or lower Level than it from your GY to your hand.
You can only use this effect of "Armed Dragon Lightning" once per turn.