CommentStreams:1e9122b2aa6ef272009a1eced6994d2d

Thank you all for the suggestions. Using the fireball artifact seems to increase the chance to success. So I swapped in the Fireball and beat the level in 1 try by Oglodi in my 19.2K Fair deck just before my last card with the Fireball appeared. That means that the Fireball is not really needed. The main thing I did was to upgrade my deck so that most of my cards' health >5640 to increase the chance of staying alive after the first round.