The best replacement for blackmore is iommi.

The best alternatives to blackmore are rated as following:
★★★★★  iommi
★★★★  jimmy page
★★★★  malmsteen
★★★  nat c
★★  fireball
★  gillan
★  ian gillan
★  steve morse
★  schenker
★  tony iommi
★  yngwie malmsteen
  tommy bolin

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Speaking about blackmore, one probably shouldn't forget about deep purple.

Other search terms related to blackmore and their ratings are:
★★★★★ deep purple
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