Most of the reviews for London Library are from way back in good old 2015, and honestly everything they've said is pretty spot on. However the card pool has expanded in a big way and there some new interactions kicking around for London Library! So a small update is in order!
The main combo I've noticed (there are most certainly many more) has to do with the 'Brid' breakers out of Criminal. So we are talking Peregrine, Saker and Golden. Alright so the key to this combo is the fact that the brid breakers uninstall themselves and move back to your grip when you use their ice derzing ability. That allows you to save the that you would normally need to use to recover them off of London Library.
Using London Library you avoid having to pay their stupid high install costs! Instead you can use those credits to break and de-rez ice! Depending on the ice you can do some serious economic damage to the corp! However the bird breakers are still kind of expensive just to operate. That's where Şifr comes in. It can lower the strength of a single piece of ice you encounter each turn to 0. This means once per turn you could derez pretty much any card in the game for an average of about 5 credits.
1 Install bird breaker of choice on London Library.
3 Run on the sever of your choice. Encounter the ice you wish to derez and lower it's strength to 0 with Şifr. Pay the break cost of the ice then pay 2 to de-rez target ice and add the bird back to your hand. Jack out or continue the run depending on remaining ice in sever.
4 Pick back up Femme Fatale.
Versus glacier decks this is a pretty legit tactic; here are some examples of de-rez costs.
DNA Tracker would cost 5 with both London Library and Şifr installed. It would cost 9 for Peregrine to break unaided and that's not counting it's install cost of 5! So that's 14 to de-rez normally or 5 with London Library and Şifr!
Assassin would cost 4 .
Curtain Wall would cost 5 .
However this tactic isn't super useful, versus ice that has low res costs.
Komainu is also another good example. Golden would cost 6 to break and then 2 to de-rez, however it only costs 5 to res...So that's not a huge value, especially considering it's only 3 to break with Mongoose
Any how that's all for now.
-Karl Vancouver Meta