Due to the sheer amount of ice in the game, many corps are currently only running 2x copies of any given ice, there are however exceptions. Data Raven, Pop Up Window, Eli, Bronze, Silver, Curtain Wall, Fire Wall and Lotus field. These cards are key players in-faction (Frequently run outside, in fewer numbers) and are often run in Triples, they are also complete Btds to deal with.
Immolation Script is perfect for dealing with them, winning itself two places in all my Anarch deck.
Things it works well with
Hacktivist Meeting: That current event all Anarchs are running.
One thing I must point out from playing, is that this card tends to float around in your grip for quite a while, until the opportune moment. This is totally Un-Anarch and quite counterproductive to the play style.
Oh, and it can't kill Architect, another card that's very common in multiples