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You can tell that its one of the reward cards from the championships by the code, which notes its exclusivity
Some equipment have both flash and an auto-equip ability: Embercleave, Mithril Coat, or Dueling Rapier can be played as instants and upon entering the battlefield you can directly attach them to one of your creatures
This card hasn't been on the market long, but its price has dropped, so it's likely one you want to avoid for now
The Rise of Sozin acts as a board wipe, extraction effect, and then transforms into a bomb creature
The small number of cards required to make this combo work make it possible to run this single-card engine in multiple different decks as a way of bringing extra effect negation to your play to slow your opponent down