Ownership question,anybody know?

[moss monster]

Player A uses a sorcery card that says, search player Bs library and take any creature card and put it in your hand under your control.On player As next turn he puts into play this newly obtained creature.Player B plays an unsummon spell..............player b says this creature should go back to him because he was the original owner.Or would player A assume ownership.Any takers?

[Arix]

A card's owner is the player who originally had it in their library - in this case, player B.

Also, that's not what the sorcery in question does. A card can never be in the hand of any player other than its owner.

[moss monster]

True,,,its says put directly into play under your control.

[moss monster]

player B would get the creature to his hand? Wow that sux.