A really, really bad card. Consider that, in many cases, this is essentially a blank card with a trash cost of 3: the runner just pays those 3 credits into a trace rather than for a printed trash cost. A 0/3 upgrade with no ability is unplayable. The only two cases in which this card would seem to do anything are as follows: 1) The runner has fewer than 3 credits when they access it -- possible, but unlikely. In this case they can spend 2 clicks or take a brain damage, which is like a mediocre encounter with a piece of Bioroid ice. 2) The corp has enough money to make the trace component relevant. Ok, then you have paid some number of credits to, once again, force the runner to spend clicks or take brain damage. The only thing that might look mildly appealing about this card is the words "brain damage" -- but if this simply said "the runner discards a random card," it would be even easier to take the tinted lenses off and realize that this card is no good.

About the only mildly exciting thing you can do with this card is put it in a remote server with Warroid Tracker and tempt the runner into spending more credits to trash it -- in which case, you've just built the world's worst Manegarm Skunkworks.

A much maligned card, and with good reason, since there were very few things that could be done with it 'back in the day'. But, since the release of the Borealis' Thule Subsea: Safety Below, Ontological Dependence, and Mr. Hendrik, inflicting core damage has become a much more enticing prospect. Coupling it with the (surprisingly still) legal Riot Suppression and MCA Austerity Policy makes Tempus' trace value a means of keeping the runner's credit balance in check, if not outright helping you score Ontologicals along the way. I've had games where a lone Tempus guarded an Ikawah, because the runner knew stealing it would mean dealing with the tag and bag I had in store for him sooner than he wants. All in all, a useful card in core damage-oriented decks, the ones that hurt the most.