I was trying to run through the puzzles today, and I came across a bug in puzzle 51 that makes it nearly impossible to beat (I suppose if you get lucky enough you can…)
For some reason, when I attack the Maceman with my Master Swordsman, its health goes to 1 instead of -1, making it impossible to actually just have the Steamforge Enforcer remaining on the board. This means, of course, that the chalice has 2 options for giving +1/+1 instead of just one.