my 2 -82000 hydrogen bombs combined with the power-up that squares numbers that go through the minus sign, possibly with other power-ups that I forgot about because I couldn't check them after obtaining them, dealing like 3e11 damage while the bosses were barely at 2e7, in the beginning it was fun but then it got quite boring as the bosses were scaling really slowly & there were never any good rewards, dare I say there were mostly only detrimental rewards, apart from the rare x2 that landed on my 2 military weapons. I got to level 89, a plus boss ended me despite my "positive numbers deal damage too" power-up, my 9 turns & my 7-card large deck to consistently draw my 2 monuments (I got a "turn all numbers negative" followed by a "mirror 2 cards" & a "remove all negative numbers", so I got a deck with only 2 massive cards)