A damage-doubling creature is almost always viable, and he is pretty close to being on par in mana without considering how strong his ability is
As a result, many MTG players have been doing just that in both Commander and even Modern
Flipping it allows you to discard your hand, then draw three cards
Players can always just pay the requested mana, or, for each 1 in that cost, they can tap an untapped artifact or creature they control rather than paying the mana
Some decks focus on it as their theme, looking to shut down opponents at all stages of the game
Each Prerelease Pack contains the following: 5 Magic: The Gathering | Avatar: The Last Airbender Play Boosters 1 Seeded Magic: The Gathering | Avatar: The Last Airbender Character Booster Each Character Booster is themed around a different Avatar: The Last Airbender character and a color of Magic