Blacksand castle (U)

[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 2 or more different world names on cards on your field, you may put this card from your field into drop zone. If you do, for this turn, the next time you would be dealt damage, it is reduced by 3.