Terrain Transmutation is at least reasonably useful. There are lots of times when I might want to switch the surfaces of things. It's at least something I've found much more useful than Smoke Cover, even if a lot of that is out of combat.
Bleed Fire is probably one of the worst. Like, when exactly would that ever be more helpful than detrimental?
Corpse Explosion is very disappointing because of how cool it sounds, and how impractical is is to ever actually use.
