Spell
FieldSupreme Marine Fortress Magnum Overbase
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13
[REQUIREMENT] Activate this card if your LP are lower than your opponent's. [EFFECT] While this card is face-up in the Field Zone, face-up Level 7 or higher Machine Type monsters on the field gain 400 ATK, and face-up Level 10 Machine Type monsters on the field cannot be destroyed by Spell/Trap Card effects.