Ubik

The ultimate in credit denial. Drop their credits early and on as many turns as you can. The runner's calculations are continually foiled by nickel and diming them on everything. Stealing an agenda is almost always such a credit swing that you can fast advance for the rest of the game while they struggle to keep money.

Loses hard to: Temujin, Film Critic, Whizzard. You can put an Informant in there to deal with the second but the others are just like, welp.

:)