The more I look at this, the more I realize that it needs some modifications. The Destruction allegiance ability is great, but it's in a locus surrounding heroes, and I currently only have two. Also, I have only one wizard, and I think I need a second. The moonclan shaman needs to be able to cast curse, so I need a backup caster to cast shield. Finally, I'm not sure I need three units at 40. I think two would suffice, with a second smaller unit with bows.
So, this 2.0 version list is looking interesting to me:
LEADERS
Grot Warboss (80)
Moonclan Grot Shaman (60)
UNITS Moonclan Grots x 40 (240)
Moonclan Grots x 40 (240)
Moonclan Grots x 20 (120)
Grot Fanatics x 3 (90) Grot Fanatics x 3 (90)
MONSTERS
Mangler Squigs (240)
Colossal Squig (300)
Troll Hag (400)
WAR MACHINES Squig Gobba (60)
BATTALIONS Great MoonClan (80)