Your search for "harmonic sliver 663" revealed the following:
Harmonic Sliver - Surprise Slivers (Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Luca Zontini Card Text: Surprise SliversAll Slivers have “When this permanent enters the battlefield, destroy target artifact or enchantment.”...