The best replacement for regenerate is anger of the gods.

The best alternatives to regenerate are rated as following:
★★★★★  anger of the gods
★★★★★  supreme verdict
★★★★  deathtouch
★★★★  exile
★★★  destroy
★★★  infect
★★★  first strike
★★  doom blade
★★  regenerate
★  wrath of god

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Speaking about regenerate, one probably shouldn't forget about sacrifice.

Other search terms related to regenerate and their ratings are:
★★★★★ sacrifice
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regenerate
anger of the gods
supreme verdict