Subterror Behemoth Ultramafus

 Keeping with the the Mediterranean Sea theme of the Subterror Behemoths in the OCG, this card's Japanese name is a reference to the Balearic Islands.

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This card has the highest Level and ATK of all Pyro and Flip monsters.

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Subterror Nemesis Archer and Subterror Nemesis Warrior appear in this card's artwork (in the upper-left corner).

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This monster is possibly the same volcano that appears in the artwork of The Hidden City.

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OCG Rulings

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The effect "When a face-up monster you control is flipped face-down, if you control no face-up monsters: You can Special Summon this card from your hand in Defense Position" is a Trigger Effect that activates in the hand. (It does not target. It cannot be activated during the Damage Step.): Subterror Behemoth Ultramafus

The effect "You can Special Summon this card from your hand in Defense Position" cannot be activated when a face-up monster in your Monster Zone is changed to face-down Defense Position by an effect activated as Chain 2 or higher.

The effect "Once per turn: You can change this card to face-down Defense Position" is an Ignition Effect. (It does not target.)

The effect "FLIP: You can change all other face-up monsters on the field to face-down Defense Position" is a Trigger Effect that can optionally be activated when "Subterror Behemoth Ultramafus" itself is flipped face-up. (It does not target.)

The effect "You can change all other face-up monsters on the field to face-down Defense Position" can be activated even if "Subterror Behemoth Ultramafus" is flipped face-up during the Damage Step.