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Old sets do not 'cycle out' of tournament legality, the only cards that are banned or limited are those on the official banlists. You can still use a card from something as old as the original Yugi starter deck, just as long as it's not on the banlist.
There are official copies of obelisk and the winged dragon of ra. Those may be used in tournaments. If your Egyptian god has a colored back, you may not use it
promo cards are special cards given to players upon winning a Pokemon card tournament... so yes
Players may use the God cards in casual Duels (however, it would be wise if effects were agreed upon prior to the Duel if you are using the tournament-illegal versions). You may NOTuse these cards in officially sponsored Duels or tournaments (tournament-legal versions may be used).
Yes. The Forbidden/Limited list does not restrict the use of cards mentioned for casual players. They are strictly for reference and the cards listed under "Forbidden" cannot be used (or are "forbidden") in official (Konami, Upperdeck Entertainment, Shonen Jump, etc.) sponsored tournaments or duels.