Random old mobs have good, sometimes lengthy buffs to steal dyna beastmen or mobs like scorps for example. Most newer content either cant be stolen or it resists, typocally the former sadly
Ice spikes, use it as a free dispel. Maybe if you're soloing EP, use it on a Camel after it uses Berserk for an insane attack boost that you can pair with Last Resort and get yourself smoked. But yeah, EP mobs sometimes use a buff you can steal