This particular slumber seems too easy for our group. What ends up happening is we farm him for TONS of Ether with almost no risk. We then immediately enter Lucid Mode which just lets us farm Ether even faster. (Note, he has a Contact/Assault 10 action for 1 Ether)
his Basic and Special actions do nothing until he Morphs? And with Lucid Mode it’s pretty easy to find cards that block turn steps or add/remove Turns to avoid him from ever Morphing at all.
Yes, this Slumber ultimately broke the game for me and my brother too.
We were playing along just fine with the challenge of the game as intended, but eventually he (playing reaper and having built a "wrath deck" was reliably able to hit 10 or 20 wrath every turn if he played well. Then he Lucid Dreamed the first time. He has every Ether token on his board, and can just Lucid into every dream we try and he just gets to interact with all the pieces and fear nothing because he can always just Lucid again right after