Cabal creation is a very big thing in CF, and is usually immortal-driven.

There aren't any OOC requirements, like gather 3 leaders and a bazillion gold.

I'd imagine you'll just have to be a great roleplayer, get lots of immortal attention,

HAVE A REALLY, REALLY WELL-THOUGHT OUT CONCEPT THAT CURRENTLY ISN'T BEING FILLED

and be a great, great, great roleplayer.

So the answer is that youre almost guaranteed NOT to have it happen. Unless you somehow perfectly time your crusade with a spark of interest from the immortals. Coming up with an idea/concept good enough usually requires more than one brain.