Your search for "Synchronous Sliver 48" revealed the following:
Synchronous Sliver (PLC) from Planar Chaos, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: E. M. Gist Card Text:All Slivers have vigilance.
Synchronous Sliver (Foil) (PLC) from Planar Chaos, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: E. M. Gist Card Text:All Slivers have vigilance.