Ebony Maw and Dr. Strange protected behind Wanda's shields would be very frightening opponents. Dr. Strange opening portals to drop Thanos, Hulk or Kurse on top of fighters is a scary thought. Hela and Ego are basically unkillable. SB Thor spamming lightning AOEs would kill any non-kryptonian on the DCEU team. To be honest, only Superman and Zod are real threats to the MCU. Doomsday and Steppenwolf are strong but the MCU team have loads of ways to deal with them... for example simply levitating them off their feet.