Fireflinger

{g}: Add {r/g} to your mana pool. This mana does not empty from your mana pool as steps and phases end until the beginning of your opponent's next upkeep.({r/g} provides both {g} and {r} mana, but provides only one mana at a time.)
At the beginning of your end step, Fireflinger does 1 damage to target creature for each red mana in your mana pool.