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Stronghold the Moving Fortress

Rarity
N
Card Type
Continuous Trap
Card Text
Special Summon this card in Defense Position as an Effect Monster (Machine/EARTH/Level 4/ATK 0/DEF 2000). (This card is also still a Trap.) While you control "Green Gadget", "Red Gadget", and "Yellow Gadget", this card gains 3000 ATK.