What was your biggest stroke of luck with this game?

Mine was this:

I had GT and DW in sync (well, SM too), and I was debating whether to lower the cooldown further or buy a new UW, in the end I decided to save for my next UW (800 stones) and leave the cooldown at 3:20.

I wanted BH, SL or CF, and my roll was BH, PS and ILM. Easy choice, I knew BH and GT sync was important, but I didn't know that BH's cooldown starts exactly at 3:20! My income almost doubled from D1. Luckily I was also saving to unlock my next card slot, so I had enough gems to rush the second BH, I did a couple more lab research and in a week I went from 250M CPM to 1B!