Devourer of the Rampage

All creatures you control gain Hellfire and {p/b}{p/r}: Activate Hellfire on this creature. This
can only be activated once per turn.
At the end of your turn, for each time Hellfire
was activated this turn you gain x life and your opponents lose x life for each time Hellfire was activated.
Its face exudes a fearsome malice, and its hide is as
tough as armor, as if it were the physical manifestation
of the grudges of fallen warriors.