Stronghold the Moving Fortress | SD10-EN031

Set: Structure Deck: Machine Re-Volt
Number: SD10-EN031
Rarity: Common
Attribute: TRAP
Card Type: Continuous Trap
Attack: 0
Defense: 0
Description: 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.) While Green Gadget, Red Gadget, and Yellow Gadget are all face-up on your side of the field, the ATK of this card becomes 3000.