They werent known about until a tweet from the official Disney Lorcana X account at the event
As those challenges become greater, stronger spells and abilities become available
To start, his first auto ability is one that activates when he enters the field: When Shinryu enters the field, deal 10000 damage to all the Forwards of cost 3, 6, and 9 opponent controls. Theres a restriction on the targets, but 10,000 damage is high, and it would generally be possible to break most Forwards meeting the cost conditions
More specifically, you'll need to attend a prerelease event for the set at a Disney Park, and these promo cards will be handed out to those who are in the queue waiting to buy their Wilds Unknown products, according to those who have attended previous events.
Da sieht man, was hier mglich ist, auch wenn man, wie ich, nur Casual spielt
But, just like in any Lorcana launch, some cards blaze ahead of the rest