You are Amanda Waller.
You are in charge of Task Force X. You must select a team of seven CRIMINALS for a mission that as yet, even you have not been cleared for.
Who are your seven? And you're looking for a balance as the mission as yet is unclear. It could be go to Apokolips and kill Darkseid, kidnap a child from the Markovian royal family, break someone out of Blackgate Prison or even steal weapons from Atlantis.
Assemble your Suicide Squad, using only DC criminals and villains (may do a Marvel one later)