The best replacement for shaco is akali.

The best alternatives to shaco are rated as following:
★★★★★  akali
★★★★  olaf
★★★★  nocturne
★★★  xin zhao
★★★  warwick
★★★  udyr
★★★  jax
★★  teemo
★★  twitch
★★  katarina
★  leblanc
★  karthus
★  evelynn
★  ad shaco
★  shen
★  rammus
★  kassadin
★  royal shaco
  nidalee
  gangplank
  ap
  twisted fate
  mordekaiser
  ap shaco

Your alternative for shaco is not listed? Suggest!
Speaking about shaco, one probably shouldn't forget about crit damage runes.

Other search terms related to shaco and their ratings are:
★★★★★ crit damage runes
★ frozen mallet
You have in mind a companion for shaco and it is not yet here? Propose!



Google Trends

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shaco
akali
olaf