One interesting interaction with Negotiator is that the "The Runner can pay 2 to break" is a card thing, not a subroutine thing (unlike Swarm ). Which means that for 4 credits your Wormhole now has teeth, which can be very fun.

Can't believe none of you guys mentioned Assassin as a card it effects, which already has great traces and decent strength

I think this interaction is only marginally good, if at all. Either the runner has no solution against Assassin, then it's great on its own, or the Runner use Faerie/Sharpshooter/Deus X/D4v1d, and it won't help at all. BTW, it's a thought about these 2 cards together, not about each one by themselves. —