
Joyd |

A few patterns I've noticed -
In addition to Dispel Magic, monsters -really- like Invisibility. This does not really help with Spell Immunity.
Paralyze and Charm are common on monsters, especially the latter, but they're often slotted at levels that makes them useless unless you're fighting the monster when it's several CR above you, and they're sometimes even lower than that. Despite this, they might still be the most common offensive monster options.