Elektron Drache
Effect Monster
LIGHT Dragon
★9 ATK 3000 DEF 2500
If you control an "Elektron" or "Proton" monster: You can Special Summon this card.
If your opponent declares an attack: You can change this card to Defense Position, and "Elektron" monsters you control cannot be destroyed by battle.
You can only use each effect of this card once per turn.