There is no real card called Seal of Orichalcos. The soul-stealing mechanic would be tricky to implement in real life.
For one specific tournament, some prints of the card were created by Upperdeck for that event. However these are not 'real' Yu-Gi-Oh cards in the full sense of the word, despite being made by upperdeck, they were still fan creations and not real game cards.
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Never.
No you can not get it unless you crappin own the whole yugioh area.
No, he isn't released yet or will never be released.
I'm not sure if the anime was 100% consistent, but I think this is all the effects - all your monsters increase their attack and defense by 500. You can place monsters in your Spell and Trap Zone, and if they are behind a monster in the monster zone, they can't be attacked. Seal of Orichalcos cannot be destroyed, negated or removed from the field. The loser of the duel loses their soul.
On Episode 159 "Trial By Stone", Yami gets punched in the face by Joey for becoming dismal over Yugi sacrficing himself to the Seal of Orichalcos. In the English dub, the punch is cut out and we only see that it was implied.