Grab a friend and come to play the new Magic: the Gathering set, Kaladesh.
Each team of 2 will have 8 packs of Kaladesh (plus however much basic land is needed) and 45 minutes to build two 40 card decks. Play pits each team against other teams in single games to determine who is the Two-Headed Giant-est.
Find more details about this format here. Note the above deck size limit is based on this being a sealed event and overrides the constructed rules.