I am loving my Gullinbursti. I have him maxed with 4 emblems right now. He is best used in story mode, as he can over-heal during the mob levels and have your heroes ready with up to double their actual health for the boss level. His slow speed is harder to utilize in raids + on titans, but honestly I put him as my tank on raid defense to try and cup drop and I actually went up in trophy count.
I enjoy that he’s not only a healer, but attacks as well. The attack up + delayed attack are a nice bonus, but you do have to wait quite long for them to go off since he is a slow mana hero anyways. The tile damage increase from the attack up is nice. Also, the delayed attack is considered a buff while building up, and can be dispelled by the enemy.
He’s one of my favorite heroes to play with and I’m looking forward to leveling mana troops enough to speed up his special.