Infinite Flame Technique

The user first creates a clone that is shaped like themselves but is composed entierly of fire. This clone due to being made of fire is incredibly light and as such can move very fast and jump very high. It can also change its shape so long as it has sufficent fire. Due to it being composed of fire it burns whatever it touches and can completely engulf somebody within itself. What gives this jutsu its name is that even if some of it is dissipated it can gather more fuel (ex. wood, oil) to repair itself. This clone can even concentrate more fire to make it more dense, increasing the power of itself. However this clone is still vulnerable to regular fire's weaknesses, such as water. This clone if it can avoid fire's weaknesses, than it in theory can stay on the battlefield forever.

Trivia

 * The inspiration for this technique came from the Second Mizukage's Steaming Danger Tyranny