You don't. It's a GBA or Shonen Jump promo only.
Zero. In case you didn't notice, THIS CARD CANNOT BE USED IN A DUEL.
He does not, he is a Shonen Jump promotional card, in the magazine itself.
If you want, yes. You can put three of them if you wanted to, they are not limited or semi-limited.
No, he has only ever been a video game promo, or available as part of a Shonen Jump Magazine promotional offer.
Neither the legal version of Ra nor Obelisk are limited, you can use two or three of each in the same deck.
I believe it coincides w/ The Tower of the Ryder-Waite deck. It's been so long since I've had a tarot deck that I don't recall the meaning of the cards themselves....something about change (and if inverted, it would mean stagnation).
The Washington Monument is a fine example of an obelisk. Just look at that obelisk!
Obelisk is a noun.
obelisk
hexagonal obelisk
That's the third obelisk we've uncovered this week! Pardon me, sir, your obelisk is double-parked.
I don't know who constructed the obelisk because you are not asking specifically WHICH obelisk. There are many obelisks in the world to choose from.