I love builder. It is cheap to res, it is mobile, it's expensive to break, and it quickly builds up ice all over the board. This thing can make am ice wall really hard to break really quickly, and it will get your cosmic ice out cheaply. The best part is that it forces the runner to essentially help build your servers, how can you not love it?

The sad thing is they will only let it trigger once. However having a 4 strength, 2 subs ice they <i>want</i> to break is pretty nice. —
Don't forget the other important thing about builder, movement! —
And by that I mean it can function as inside job protection and shut down Kit's ability and protect other codegates from spooned. And it never suffers from the normal positional ice problem. —