Blacksand Castle (X-BT03/0073EN) (X-BT03)

[Set] (This card remains on the field.)
All "Thunder Empire" on your field cannot be returned to hand by your opponent's card effects.
[Counter] [Act] During your opponent's turn, if you have two or more different world names of cards on your field, you may put this card from the field into the drop zone. If you do, for this turn, the next time damage would be dealt to you, it is reduced by 3.