Your search for "Taunting Challenge 46" revealed the following:
Taunting Challenge - Borderless Source Material (TLE) from Avatar: The Last Airbender Eternal, available at 401 Games Canada. Rarity: Mythic Rare Finish: Normal Artist: Viacom Card Text:All creatures able to block target creature this turn do so.
Taunting Challenge - Borderless Source Material (Foil) (TLE) from Avatar: The Last Airbender Eternal, available at 401 Games Canada. Rarity: Mythic Rare Finish: Foil Artist: Viacom Card Text:All creatures able to block target creature this turn do so.
Taunting Challenge (PTK) from Portal Three Kingdoms, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Gao Yan Card Text:Choose any one creature. This turn, all creatures able to block it do so.