[__jal]

Lots of automation executes on a schedule. If you control time, you can cause something to happen (or not happen) as you like.

Use your imagination. Don't forget to combine this with other attacks - if you compromise something your target talks to, for instance, or with non-technical actions - shorting a stock, maybe.

More generally, the two major assumptions that a lot of complex systems depend on are time and identity. There are a lot of games you can play controlling one of those. (Controlling both is better, of course.)