Good old Adrena-frogs. The forest spirits are an interesting twist, but I think cockatrices are better in this situation, especially as you're going to be winning in 5-6 turns often if playing level 3. If it is a level 3 grinder, then you don't really want healing, but as Bloodshadow said, heals would be more effective than empathic bonds, as you're not going to have enough creatures out to really feel the benefits of them.