I know there that the anime version of God cards are: overpowered, effects are not unclearly specified in the card text, and illegal to play in tournaments and private matches.
My question is about the legal version. They can be normally played in tournaments and private matches? or just private matches? I'm confused because I don't see these cards included in the official forbidden/limited list.
Also, in private matches, do I need to inform the opponent BEFORE the match that I'm using legal version of God card (so he doesn't cry later), or it's totally fine/legal to surprise him (LOL)?