I'm against Farage winning seats in parliament. I wasn't when he was UKIP leader, because UKIP had a proper manifesto that covered more than just 'we need to leave the EU'. The Brexit Party does not have a manifesto, it is just a protest party. It cannot govern, even in a coalition, as it has no policies.
Don't worry, it's not going to happen. Mr Farage claims that several of those involved in the tory feeding frenzy leadership race have approached him offering a pact and he's having none of it. His party stormed the pseudoParliament election for obvious reasons but I seriously doubt they can present more than a minor annoyance to the big two at home and they might not even beat the Lib Dims. I doubt they've got enough viable candidates to meaningfully influence a coalition anyway.