The best replacement for gambit is cyclops.

The best alternatives to gambit are rated as following:
★★★★★  cyclops
★★★★  nightwing
★★★★  deadpool
★★★  fnatic
★★  gamut
★★  roccat
★★  bishop
★  shc
★  sk
★  millenium
★  new sun
★  c9
★  alliance
★  bullseye
★  nightcrawler
  chicken scheme
  new son
  najin black sword
  taipei assassins
  kings gambit
  daredevil
  gammet
  icem cfd
  iceman

Your alternative for gambit is not listed? Suggest!
Speaking about gambit, one probably shouldn't forget about rogue.

Other search terms related to gambit and their ratings are:
★★★★★ rogue
You have in mind a companion for gambit and it is not yet here? Propose!



Google Trends

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gambit
cyclops
nightwing