Create a team of characters. Simple. But there's a catch (or four or seven):

Teams must consist of core MU characters ONLY (this excludes Marvel/DC Amalgam characters, or any branch-off's like Malibu, New Universe, Marvel 2099 (or subsequent future/alternate reality groups, unless they have appeared in the Core Marvel Universe[ie: Guardians of the Galaxy are allowable], etc.)
Maximum of 8 characters, minimum is 3
Teams must have a TEAM NAME - team names must be ORIGINAL, no recycling old/current team names
Only one character from existing teams (current line-up)
All teams must consist of characters considered ALIVE/ACTIVE (retired/limboed characters are allowed)
For the sake of creativity, ALL X-Books (except Alpha Flight) are considered ONE TEAM (this prevents someone from recreating a new X-Team)

Have fun!