Stronghold the Hidden Fortress

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