So Sunday is the base backup. So the Monday and Tuesday backups are the changed blocks since then. Don't need archive yet. Wednesday you do another Incremental so from this point on for a Thursday noon recovery you need archive. RMAN, is generally a warm backup so you need archive to make your inconsistent backup work. So you need the base backup, all three incremental backups, and archive starting from the point just before that third incremental backup up to noon on Thursday.
Thursday at noon do I need archive logs from Sun-Wed? Or just Sunday level 0, Mon-Thur level 1, and Thur archive log backups.