It's super oxidative, AND corrosive. When you pour a normal oxidizer on metal, you get a thin layer of oxidized metal, and the reaction stops.

But CIF3 will dissolve that oxide, and keep going. And keep going fast enough that stuff catches on fire.

It's a chemical used to clean vapor deposition chambers, in tiny little ampules. The idea of using it rocket-sized volumes should make every sane person run for the hills.