Forum:Forbidden Chalice

Okay, here are many situations that I want information. 1. If I target Great Maju Garzett with FC and end the turn, did the ATK of GMG will turn back to normal + 400? 2.Also about GMG, If book of moon flip it face-down and later he become face-up, will it's ATK be the same as beginnig? And what about special summoning him from the graveyard if he was sent there from the field? 3. Forbidden Chalice's effect to increase ATK is permanent OR not?