Standoff

From BoardGameGeek:

Standoff is a 30-60min fixed-deck battle-royale card game. Each player will command 8 unique super-powered champions and pit them against other players' champions to claim victory as the last player standing! The Master Gatherer, a mysterious cosmic being, scours the universe for the most worthy of champions to compete for glory, honor, and power in the highest-stakes arena this universe has ever seen: Standoff. However, each team of eight mighty champions must be commanded by an overseer. The Master Gatherer invites you to choose a team and become an overseer. Will you accept his invitation and enter Standoff? Many different champions have joined Standoff, all with their own unique abilities and fighting style. More overseers entering the arena mean more challenges you must face. Play to your champions strengths at the right time and victory will be yours! -description from the designer