Although the Angel token created by the triggered ability is attacking, it was never declared as an attacking creature (for the purposes of abilities that trigger whenever a creature attacks, for example)
Tokyo, Shogakukan and JR Kikaku copyright
Because of all this, the card was known by many to really exist, but with the lack of official confirmation and no copies to point to, an air of mystery and desirability grew over the card
You can't cast the cards you drew to avoid having two cards to choose.
Perhaps its to be expected
In the story, Giratina was a violent dragon that caused Arceus to take drastic measures to prevent further destruction on its part, banishing it to this Reverse World, where time and space do not apply there, and Giratina ensures a balance between Palkia and Dialga do not face the shocks of their powers