Steal Ward is a Ice Spell, Steal Charm is a Fire Spell, both schools learn this after they finish the Krokosphinx so unless you make a wizard of one of those schools you can't get it, Balance gets a Heal Over Time Spell known as Helping Hands
Steal ward is an ice school spell but the polymorphs gobbler and ninja pigs have it. Steal charm is a fire spell but the polymorph ninja pig has it. I don't think that balance has that. Myth has a spell pierce that destroys the shield. Storm has spelll that destroys the charm. (can't think of it off the top of my head.