Seriously this item had a song made out of it. DFG is a niche item. It served the purpose of having high ap and some CDR. Remove the damage amplification and slightly increase the damage its active inflicts, that way it serves as a tank destroying ap item and not an assassination tool.
The active is pretty stupid too... The issue is why riot hasn't nerf the shit out of 
yet.
Why would they? The item was introduced when tanks were dominating the game.
DFG originally did 30% of the target's current HP and got another 3.5% per 100 ability power. Then it went to 15% +5% per 100 AP. Then it got changed to 15% max and 20% damage amp. It has been a problem in every single one of its forms, so Riot is just axing it.
Even if you increase the active damage and remove the amp, it will still be an assassination tool against squishies. The reason for this is because tanky champions will buy some sort of MR while squishy champions will not. So even though numerically it will deal more damage against tanky champions, percentage wise, it will deal more damage against squishies. In that respect it will still serve as an extra nuke to assassinate squishies.
