The best replacement for thors is zerg.

The best alternatives to thors are rated as following:
★★★★★  zerg
★★★★  ultralisks
★★★★  void rays
★★★  banelings
★  battlecruisers
★  mutalisks

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No companions for thors have been suggested so far.
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Google Trends

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thors
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ultralisks