Spoilers Below!
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1.45 trillion in one box. I think I can safely say I can play endless mode for a very very long time, maybe indefinitely.
Spoilers Below!
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Heres my main setup, the cat provides 2-3 guardian cards per box sold. The constellations provide as many rerolls as I could ever need, and the hat thing decreases in value each turn by 8. The dividers serve to double up both the hat, and the cat. With my boxes special abilities, the edges are doubled in value, and the temporary cards stick around until they are used.
This setup is limited tho.... since the hat only grows linearly, not exponentially. The guardians are powerful, but they don't scale with time. Even with my 5% interest, I couldnt keep up with rent inflation. Perhaps theres a better long-term setup that I havent discovered yet... I've only played 2 runs so far, but I was able to unlock every starter deck after this run.
Heres my final stats:


