Wild Satyr still looks like a crap hero, even with the Legendary skill. I would suggest swapping in Centaur of Attention's Legendary skill in Wild Satyr's place, once it is created, for the next update, because he needs it far more.
A beginning of wave instant summon of a skeledeer, along with activating his White skill to explode the skeledeer, damage enemies, and summon another one, for his Legendary skill, would make Skeleton King better.
Unicorgi should have some other Legendary skill, another heal might make this hero too overpowered.
All heroes with shields should block energy drain and control effects by default when they are shielded (Dark Horse and his team, Brozerker), and their shield should not have any time limit, without any Legendary skill.
Dark Horse's White skill does crap damage, unless Skill Power is boosted, so Dark Horse's Legendary skill should reapply the team shield when his White skill is activated, since that is his only good skill. Dark Horse's team shield skill should have damage absorption scaling based on Skill Power, because the damage absorbed is too low.