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.
Neither the legal version of Ra nor Obelisk are limited, you can use two or three of each in the same deck.
No, he has only ever been a video game promo, or available as part of a Shonen Jump Magazine promotional offer.
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
hexagonal obelisk
Obelisk is a noun.
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.
That's the third obelisk we've uncovered this week! Pardon me, sir, your obelisk is double-parked.