Same here! I can’t start the brawl. Tried normal hero, 1000 win, restarted my iPad, still nothing.

I rewatched the video and the Horror’s card text is “Battlecry: Cast x and y.” Shudderwock will then give you another Horror to your hand (not sure if spells learned will be the same or random). Shudder will also cast the spells of the original Horror probably with random targets. I am assuming this will occur because Shudder’s interaction with Stonehill Defender gives me a random taunt minion to my hand (Shudder does not allow for Discover). Will be fun to play with this!

Love the concept of this card. Will be fun to try out with Shudderwock, but remember Mistcaller was a 6 mana 4/4 with a big effect but never saw much play. If the meta is fast, this card may be too slow.