Darkmoon Card: Wrath

This is one of the four available Darkmoon Cards trinkets added with the Burning Crusade expansion.

Source
This item is obtained by gathering all eight of the Storms cards, creating the Storms Deck by right-clicking on any of the cards, and turning in the deck to the Darkmoon Faire. All the individual cards and the deck itself are BoE items. Cards 2 through 4 are world drops, 5 through 8 are world drops from elite mobs, and the Ace drops from end bosses in instances.