Stronghold the Hidden Fortress

Special Summon this card as an Effect Monster (Machine/EARTH/Level 4/ATK 0/DEF 2000) with these effects. (This card is also still a Trap.) ● Gains 1000 ATK for each card you control that is "Shining Sarcophagus" or a monster that mentions it. ● Once per turn, when an opponent's monster declares an attack while you control "Shining Sarcophagus": You can destroy that monster.