Yellow-Bellied Oni

 This card has two counterparts, Blue-Blooded Oni and Red-Headed Oni.

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This card has the ATK of Blue-Blooded Oni and the DEF of Red-Headed Oni. It also mirrors the effect of Red-Headed Oni.

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This is the first card in the OCG/TCG that can change the Rank of an Xyz Monster.

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OCG Rulings

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The "When you Xyz Summon: You can Special Summon this card from your hand." effect is a Trigger Effect that activates in the hand.: Yellow-Bellied Oni

The "decrease its Rank by 1, also it loses 300 ATK." effect targets 1 face-up Xyz Monster on the field.

Detaching 1 Xyz Material on your side of the field is a cost to activate the "decrease its Rank by 1, also it loses 300 ATK." effect. (An Xyz Material attached to a face-down Xyz Monster you control can be detached.)

The "decrease its Rank by 1, also it loses 300 ATK." effect remains as long as that monster remains face-up on the field.