Hows does mass hypnosis work?

i understand the basic effect but the rulings aren’t real clear….. i know that if the monster were to lose the a-counter it goes back to the owner but if the mass hypnosis it self leaves the field does the owner receive the card

Yes, same concept with Snatch Steal, Mark of the Rose

The "Stolen" monsters are under your control via Mass Hypnosis, so if Mass Hypnosis leaves the field, there will be no effect to force the monsters to stay on your side of the field, so the monsters owner will regain the "Stolen" monsters

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