Scarepbox still works .
It has alot of features .
If you use as a 2nd tier links then its best for indexing them .
SEO Lover already answered your question. Use scrapebox blasts on your backlinks.
I would go further and make sure you customize your comments/ trackbacks to contain related keywords for your niche and random anchor text.
About the amount.. I do 500 - 3000 per backlink per day, for 5-10 days. I use trackbacks mainly.
The same tools will always work. The way you use them will change. Simple as that.
It's still awesome to index, just make sure to use lots of different anchor text. The newest black hat method is using ScrapeBox directly on a competitors site, however I don't know if that will work. I think the competitors site has to be new for it to send them out of the ranks.