Showcase of Magna 3 Water with 3 Exaltos and 1 Axe. Any unit with sacc sub works for Haase. If you have Gabriel daggers (which i haven't) replace Auberon and Celestial Sword for supplemental damage.
Yes, wanpan six dragon raids for materials is easy. You can have a max 6 jewels per joined raid, and a max of 11 jewels per host raid. In Revans raids you are forced to hit blue chest (4M for guaranteed drop) for materials.