Buying an Operation Phoenix Pass will get you unlimited access to these community-voted maps in official Competitive, Casual, and Deathmatch game modes. The Phoenix Pass also gets you an upgradable Challenge Coin that will double as your operational scorecard, so you can keep track of every kill and every win you get in all Official Competitive Matches for the duration of Phoenix.
Be sure to check out the dedicated page on the official Counter-Strike website to secure your copy of the new pack.