S-Force Bridgehead

“When this card is activated: You can add 1 "S-Force" monster from your Deck to your hand. When an opponent's monster declares an attack on your "S-Force" monster in its same column: You can activate this effect; that monster you control cannot be destroyed by that battle. You can only use this effect of "S-Force Bridgehead" once per turn. You can only activate 1 "S-Force Bridgehead" per turn.”