The card is bugged.
What it does is:
- lets you choose a card
- adds the card to hand
- removes it right after
So basically you cast it to get… Nothing.
Lost a game caus I included in my kiora for madness objective.
Did not realize the bug until probably third cast 
shteev
2
I’m getting inconsistent behaviour. Sometimes the card stays in my hand, and sometimes it vanishes.
Buret0
3
I’m seeing this too. It is my only madness card in blue, so I’ve been having to play it for the ribbons.
Zak001
4
I believe it incorrectly discards the card if it is a spell, but not if it is a creature or support.