One of the highest strenght sentry in the game. But how does it compare to other sentries? Badly I'm afraid.
Each faction has a similar or higher strenght sentry that will do more than Assassin. NBN has F2P, Weyland has Trebuchet, Jinteki has Anansi and Haas-Bioroid has Bloop. Paying 7 for a 2 subs sentry, even with 5 strenght, feels bad.
So unless you want to have a lot of high strenght sentries in your deck, then Assassin is seldom warranted. Of course, if you are playing Improved Tracers, then it might be worth it, since it cost no influence and only Sherlock 2.0 and Trebuchet are tracer ices that could benefit from that agenda.
Beautiful and evocative ice, with a nice piece of lore (or quote) going along with it. Amazing job!