Your search for "Timberwatch Elf 156" revealed the following:
Timberwatch Elf (Foil) (LGN) from Legions, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Dave Dorman Card Text:T: Target creature gets +X/+X until end of turn, where X is the number of Elves in play.
Timberwatch Elf (CMA) from Commander Anthology, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Dave Dorman Card Text:T: Target creature gets +X/+X until end of turn, where X is the number of Elves on the battlefield.