Puzzle Lab: Puzzles involving the changed basic Priest cards have not been updated, rendering several impossible · Issue #1318 · HearthSim/hs-bugs · GitHub
So Astromancer Arwyn puzzle 6/7 is not doable anymore since Holy Smite now does 3 damage instead of 2 and there's no workaround for it I believe. : r/hearthstone
I know I'm not the greatest and maybe i'm missing something, and I know I'm very late to the puzzle lab, but I had played them before on different account. With that