Your search for "Challenger Troll 157" revealed the following:
Challenger Troll (Foil) (WAR) from War of the Spark, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Svetlin Velinov Card Text:Each creature you control with power 4 or greater can't be blocked by more than one creature.
Challenger Troll (WAR) from War of the Spark, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Svetlin Velinov Card Text:Each creature you control with power 4 or greater can't be blocked by more than one creature.
Challenger Troll - WAR Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Svetlin Velinov Card Text:Each creature you control with power 4 or greater can't be blocked by more than one creature.