I think I've tried a little over 30 decks I've used on previous levels and still can't seem to beat it (I have -1 btw tried it in like 14/30)

i love -77

I used a 43 (next stone free) & 77 deck, with 47 (play on top of other stones) for the end once the board fills up

I had an idea which was to break boss deck down into tiny pieces so that with 3 draws per turn he can't possibly use up all that energy without access to 100 apiece, so there'll be plenty left over for me to siphon. but it wasn't working out for me