The best replacement for archon is thanatos.

The best alternatives to archon are rated as following:
★★★★★  thanatos
★★★  ultralisk
★★★  silver arrow
★★★  immortal
★★★  void ray
★★★  chimera
★★  zerg
★  black hole
★  cm ww
★  venomous x
★  archivists toolkit
  dark archon
  succubus
  cm wizard
  high templar
  terran
  cm wiz
  archon

Your alternative for archon is not listed? Suggest!
Speaking about archon, one probably shouldn't forget about arcane dynamo.

Other search terms related to archon and their ratings are:
★★★★★ arcane dynamo
★★★ critical mass
★★ life on hit
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Google Trends

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archon
thanatos
ultralisk