Beelze of the Diabolic Dragons

 The name Beelze is a reference to Beelzebub, the Lord of Flies. The central area of the body of this monster resembles the head of a fly (the typical representation of the head of Beelzebub), and this monster is played by Sect, who uses an Insect Deck.

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In the manga, the humanoid shown between this card's two heads is revealed to be female. This is at odds with its OCG name, Devil King Dragon - Beelze.

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This monster has an evolved form, Beelzeus of the Diabolic Dragons, thus making this the first Duel Dragon to have an upgrade/evolution.

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This card resembles Arcana Force EX - The Light Ruler.

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This card's OCG/TCG artwork is taken from Yu-Gi-Oh! 5D's Ride 20: Shadow Card!! specifically from the panel showing this monster attacking Celestial Wolf Lord, Blue Sirius.

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OCG Rulings

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The "Cannot be destroyed by battle or by card effects." effect is a Continuous Effect.: Beelze of the Diabolic Dragons

The "When you take damage from an attack involving this card, or from an opponent's card effect: This card gains ATK equal to the amount of damage you took." effect is a Trigger Effect. (This is a mandatory effect. It activates even during the Damage Step.)

The "This card gains ATK equal to the amount of damage you took." is applied each time "you take damage from an attack involving this card, or from an opponent's card effect". (The ATK increases further each time.)

The ATK gained by this card's effect remains increased as long as this card remains face-up on the field.