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Event Decks, constructed by Wizards of the Coast, are a type of Magic product that have been sold as a part of each expansion since Mirrodin Besieged. Unlike Intro Packs, which are for fairly new players, these are designed to let you enter the world of tournament play knowing you've got a powerful deck that will let you be immediately competitive. Event Decks are Standard-legal during the time they are released, but can be invalidated when an older block rotates out as they usually contain cards from both blocks.
There are seven rares per deck, and they come with four copies of some powerful commons and uncommons. Each deck is designed to be able to compete out of the box, and each one comes with a strategy insert that includes tips on how to customize the deck.
The Gatecrash Event Deck Box contains 3 of each of the two Event Decks for the set Thrash and Thrive (A Simic themed deck) and Rout and Rally (a Boros themed deck).
Each Deck Contains:
a 60-card deck
a 15-card sideboard
a spindown life counter
a strategy guide