I really like enchantments like this: ones that allow for a lot of flexibility. Firebreathing is normally an ability that only single creatures will have (mostly due to things like Firebreathing) and your opponent will usually block those creatures first out of fear that you'll pump them up for the kill. This card makes even your little gribblies into threats. As long as you attack with more creatures than your opponent has blockers and, provided that they don't have any way to deal with that one damaging creature (like Second Thoughts), they're taking a lot of damage. Conversely, you can do a suicide charge with gribblies to take out your opponent's big creatures. It is, however, a little on the expensive side for red aggro decks which is it's only real drawback.
Pros: Gives firebreathing to all your creatures Cons: A little expensive for red Rating: 3.5/5