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


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
References :
5 years of experiences
Mass Hypnosis : "Activate only while you control an "Alien" monster. Select and take control of up to 3 of your opponent’s monsters that each have an A-Counter(s) on them. This card is destroyed during the End Phase of the turn it is activated."…
So at the end of the turn everything switches back to the respective players side?
References :