Just finished Demon Prince Beelzebub on auto with the following team:

Live After Death Eddie w/ Ragnarok and Cosmic Echo
Mushashi w/ Singularity
Darkstar Clairvoyant w/ Celestial and Cosmic Serenity
Beelzebub w/ Impulse.

Pretty stable other than one loss; spent 25 ironite to revive the team.
Averaged 45 seconds per run.