Mist Valley Shaman

 This is the only female monster in the Mist Valley archetype.

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This monster's feathery arms with claws suggest that she also belongs to the same race as the Harpie.

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TCG Rulings

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Returning 1 other monster you control to the hand is a cost.: Hidden Arsenal – Card Rulings (Version 1.0)

You cannot activate this effect while “Degenerate Circuit” is active.

You can return your opponent’s monster that you’ve taken control of to their hand.

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OCG Rulings

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If you control a monster which is owned by your opponent, then you can return it to your opponent's hand to activate the effect of a card like "Genex Ally Birdman" or "Mist Valley Shaman".: Can you return a card to your opponent's hand to activate the effect of "Genex Ally Birdman"?

If "Battle Fader" or "Plaguespreader Zombie" was Special Summoned by its own effect, then it is removed from play when it is removed from the field. Thus, you cannot activate the effect of "Genex Ally Birdman" by returning such a monster to the hand. Also, if "Degenerate Circuit" is active, then you cannot return cards to the hand, so you cannot activate the effect of a card like "Genex Ally Birdman" or "Mist Valley Shaman".: Can you activate the effect of "Genex Ally Birdman" while "Degenerate Circuit" is active?