The Raven's Warnings final phase can't wish you a free dungeon card, sorry to report
By turn 6 you should have been able to play a range of actions, so the hard part is choosing which youll add to your deck
Meanwhile, the 1 can combo with Felidar Guardian, but you need an extra piece for this combo to actually do anything (something like Altar of the Brood to take advantage of infinite enters-the-battlefield triggers)
It stops spells you play from being countered, it gives permanents you control Hexproof from both Blue and Black cards, and it lets you draw a card if an opponent has played a Blue or Black card
Then, your opponent switches his or her Active Pokemon with 1 of his or her Benched Pokemon
Once they get going, these cards will be fearsome to behold on the battlefield