I find Bleed Fire to be very nice when your enemies are already on fire. It makes that burning damage burn harder. I use it with Fane/Beast being spider-legged, web-tossing, cc powerhouses who keep the enemies in check, while the necro flames are working. 1 ap cost is fine for the skill(my Sebil usually has 1 spare ap most of the time). The effect may not seem like much, but I like using it and its one of those skills that works in a niche. -1 ap tea, +1 max ap tea, demon form, haste. Next turn apotheosis, meteor shower skill, adrenaline, skin graft, adrenaline, meteor shower skill, epidemic of fire. Follow up with Bleed fire and the stragglers just die. It seems like win more, but it actually helps with the final few ounces of health. This is when you burst hard. The same thing works when you're burning enemies through ordinary fire spells. And to be honest, it feels nicer to burn the enemies with ordinary fire spells ;D.
