The problem is that quillboars are all great. Each tribe has weaker and stronger pieces, but that does not seem to be the case with the boars.
Good cards need to stay though to make it work and keep it fun. I'd say the following cards should get hit:
- Necrolyte: This needs to be removed. It makes cards that would otherwise be fine, most notably Bristleback Knight and Bonker, not to mention cleave effects and other divine shield cards extremely dangerous. Removing this makes it so you have to be very careful with how to spend your blood gems and makes quillboars as a whole weaker to divine shield and poisonous.
- Dynamic Duo: Should gain only health. Maybe better stats to start but I don't think that is needed.
- Agamaggan, the Great Boar: Tier 6
- Captain Flat Tusk: Tier 5, but you need to spend 4 gold for a blood crystal.
These changes would still make the boars good earlygame, but much harder to outscale dragons and elementals with, which should NOT happen.
The early tier cards feel fine to me.