Ok to answer the does it go in their hand first question. No. It takes place in the permanant section of their field, if it is a weapon it takes the weapon slot, if it is a shield it takes the sheidl slot. Others just fill up their board.
As to when you would use it??????
Ok I have an opponent with 36 Bone Walls. I play Solar Shield and give it to my Opponent. They now have only Solar Shield to deal with.
My opponent has Hope Shield in play with 19 Ray of Light out therefore reducing my damage by 19. I Bestow on him a Phase Shield replacing his shield and then steal it back. Voila Hope Fractal now destroyed...
My opponent has Vampire Dagger in play so I give him my Dagger and voila no more +6 healing for him.
Something along those lines. Do you need any more hints?
Thanks
Scyther