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Not 100% on this one, but pretty sure Sidewinder Sliver is granting flanking to all creatures, my gobhobbler rats and rix maadi guildmage appeared to flank enemy slivers when it was on the board. Other things that I recall in play are a sliver legion and a sliver smith.

How would they flank enemy Slivers? Even if they DID get flanking, it doesn't work against other creatures with the ability...

Which cards had flanking? Enemy slivers or your rats/guildmage? If the answer is the enemy slivers, Sidewinder Sliver is working as it must.

A member of the dev team tested it and reported that the card behaviour is correct.