Deathfire touch has a bit of a item related handicap when it comes to mages.

Deathfire touch does scaling damage and has practically no base damage. The thing is, the best item for ap scaling is , but this item is usually built as a 5th or 6th item.

This cause deathfire touch to be weak until 35-45 minutes in the game when compared to other keystone. Its not a bad keystone, but it is directly tied to ap scaling with is kinda terrible on mages right now.

Just something to consider when picking up this keystone.