I don't think either of us were talking about casting Burden of Time ourselves. Rather, talking about the AI casting it, and wishing some other AI would bother to dispel it.
Interestingly, after one AI cast Burden of Time and another dispelled it the next turn, a few turns later the C'Tis AI cast Foul Air (arrgh!) and no one has dispelled it for quite some time - I'm building up the ability to dispel it myself now, and meanwhile using undead, summons, mercs and cannon fodder to fight while the "good" corps hides out and waits for the air to freshen up.
PvK