The Witch's Housecall Egg minions need some help in the decision making department. Too often does the Hard-Boiled Egg heal itself when it's already full health while it's caster is dying beside it. It also seems to cast Guiding Light far more often than it ever casts a heal. The Egg minions should be more likely to use things on the minion's caster. Blades and shields should have something like a 70% chance to be used on the minion's caster. Heals can be more likely to be used on the target with the lowest remaining percent of health.
Furthermore, if the Hard-Boiled Egg already has a Guiding Light, it should be more likely to use a different spell or consume the Guiding Light before it casts another one; just so it isn't sitting with 4 Guiding lights without ever using a heal. The Eggs should also be even more likely to use a shield on the caster if they're already defended with a Tower shield.
These are just a few minor changes to the minion's AI that would actually make them immensely more helpful in combat.