Stronghold the Moving Fortress (DPYG-EN030) - Duelist Pack: Yugi 1st Edition

After activation, Special Summon this card in Defense Position; it is treated as an Effect Monster Card (Machine-Type/EARTH/Level 4/ATK 0/DEF 2000). (This card is still treated as a Trap Card.) When you control Green Gadget, Red Gadget, and Yellow Gadget,