Your search for "Strength in Numbers 138" revealed the following:
Strength in Numbers (Foil) (MM3) from Modern Masters 2017, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Ron Spencer Card Text:Until end of turn, target creature gains trample and gets +X/+X, where X is the number of attacking...
Strength in Numbers (MM3) from Modern Masters 2017, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Ron Spencer Card Text:Until end of turn, target creature gains trample and gets +X/+X, where X is the number of attacking creatures....
Strength in Numbers - MM3 Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Ron Spencer Card Text:Until end of turn, target creature gains trample and gets +X/+X, where X is the number of...
Heart of Yavimaya (ALL) from Alliances, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Pete Venters Card Text:When Heart of Yavimaya comes into play, sacrifice a forest or bury Heart of Yavimaya.T: Add G to your mana pool.T:...