If you lose you have to pay your own court costs, but the abortion provider pays their own costs regardless. If you win the abortion provider also pays your court costs.

From what I’ve read there is nothing preventing you from filing frivolous suits against the legislators. They have to defend themselves or face a summary judgement. The law as written is wide open for abuse. This could be amended with a provision that excludes legislators and rich politically connected people.

Even better, you could do so in courts that are inconvenient for them (read: other end of the state), without any allegations that it's a proper venue for the case at all, and they couldn't move to place it in a more reasonable jurisdiction.

Granted, that provision is probably unconstitutional by itself, but it just goes to show you that the banning abortion part of the law is the least problematic part of the entire thing.