So, you want to beat the floor 25 boss do you? Well heres what I did to essentially guarantee a win.
1. Dont go big if you want to win, this makes your deck harder to predict and less reliable and ruins the core focus of this style of deck, use your floor rewards on hp and upgrades instead of new dice
2. 1 of each dice, (including mirror, very helpful in floor 25 boss) terrain is likely not to be useful, and do not use glass heal dice
3. now the hardest and most rng dependant part of the run, get a heal dice that isnt glass. This can be done multiple ways, golden scarab, mysterious backpack, but is about 50% chance in most run
4. if you have one of each dice and a non glass heal dice congratulations, from here on out you only need to do 4 things
A. always make your dice hollow if given the chance
B. Prioritise shield over attack in fights
C. end each fight with max health
D. Absolutely above all else zero in on obtaining a grow dice, (doesnt really matter which type, in my run it was a heal) you will likely be able to use it every turn and then stall out the last boss fight with lots of heals and shields, from then on its just a waiting game before you inevitably win