Yes. This is why, instead of having 2 new sets buffing Nova (which is already a top-notch build), you shall be more generic and only buff blood spending.
Alternative proposal :
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That was the original idea but it was then abused with perma-Army of the Dead leading to nearly infinite stacks. The stacks must be capped.
Alternative proposal, with damage based on number of skeletons :
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Interesting.
But stacking 10 shadows as they are powerful now would be overpowered. Like 10 Necro with Corpse Lance activated… :S
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Bone Ringer would then be the old Jesseth Arms.
Why not.
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Nope. There is No mechanic where a skill looks back at an item. The direction is always : item X boost skill Y. Loopbacks are not allowed to avoid recursive effects.
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Buffing those 3 skills at the same level while they have different damage output is risky.
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Alternative suggestion, Bone Spirit as buffing skill :
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Agree. See my Bone Spirit suggestion, it handles this problem.