Okay, now confirmed working. To hide sponsored posts on your dash, add one or more of the following to your Tumblr Savior blacklist:
N.B. make sure the quotes in a href=”/sponsors” are straight quotes, and not curly ones, as Tumblr’s text post keeps turning them into.
These will let you block sponsored posts without having to hide every instance of the words, ‘sponsor’, ‘sponsored’, ‘sponsored by’, etc.
Unfortunately, these do not work with XKit’s Blacklist extension. Sorry, guys.