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Don't nerf anything, a counter would be good, and overall better balance with the other classes is all that is required.
Things like this are very good, but often end up in something getting nerfed anyway.
For example, there is already a way of dealing with abilities like Dragon Blood, it's called ranged and melee interrupts and CC but (and this is why people want DB nerfed), Dragons Blood is instant, which means they can hold down a never ending block while they happily cast it and think they are being skillful.
Add a small cast time to it (which all abilities like this should have) and there would be plenty of counters to it.
There are also healing debuffs, but again the ability to hold block and cast hinder those as well.