The best replacement for slivers is eldrazi.

The best alternatives to slivers are rated as following:
★★★★★  eldrazi
★★★★  allies
★★★★  graveborn

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Speaking about slivers, one probably shouldn't forget about shroud.

Other search terms related to slivers and their ratings are:
★★★★★ shroud
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slivers
eldrazi
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