Your search for "Spectral Sliver 17" revealed the following:
Spectral Sliver (Foil) (LGN) from Legions, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Pete Venters Card Text:All Slivers have "2: This creature gets +1/+1 until end of turn."
Spectral Sliver - LGN Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Pete Venters Card Text:All Slivers have "2: This creature gets +1/+1 until end of turn."