Breach strat nerfed?

Breach giga strat is nowhere close to as lucrative as it was the last few days. Barely get 1 divine a run now and the scarab is 2.5.

Breach has not been nerfed, no. You're likely experiencing a dry-streak. It's not more expensive either since the cost increase on scarabs is because astrolabes went down a lot, making bloodlines the new bottleneck.

Keep in mind, the strat is priced around having at least some rarity on your gear and having scried a profitable card to your map.

If you're missing out on these things and are perhaps even running a slower build the dry-streaks will feel significantly worse.