Avatar's Wrath is a rare Sorcery card from Avatar: The Last Airbender (TLA), collector number 12. Current market price: $4.36 (foil $4.91), TCGplayer market prices via Scryfall.
Choose up to one target creature, then airbend all other creatures. (Exile them. While each one is exiled, its owner may cast it for {2} rather than its mana cost.) Until your next turn, your opponents can't cast spells from anywhere other than their hands. Exile Avatar's Wrath.