Similar to Deathfire Grasp.
[Melee Only] An Item that deals 75 Attack Damage with 400 HP OR 5% Movement speed.
Unique Passive: Deals 15% of target champion's maximum Health in attack damage and increases all subsequent attack damage taken by the target by 20% for 4 seconds (90 second cooldown). This item is activated not by range but by your basic attack.
EndlessSorcerer2 votes
Oh god.
Anyways, that passive should really be an active affect. Also, keep in mind that while Deathfire Graph has a similar duration, mages are largely reliant on their ability cooldowns for damage while AD champions can still autoattack.
Several AD Casters are already pretty strong at the moment and don't really have issues with itemization, so something like this would probably put them over the top. In addition, not every AP item needs an AD counterpart and vice-versa.
Blastermine1 votes
Anyways, that passive should really be an active affect. Also, keep in mind that while Deathfire Graph has a similar duration, mages are largely reliant on their ability cooldowns for damage while AD champions can still autoattack.
Several AD Casters are already pretty strong at the moment and don't really have issues with itemization, so something like this would probably put them over the top. In addition, not every AP item needs an AD counterpart and vice-versa.
DFG was always been a broken concept. 
got nerfed due too DFG R W E Q spam %max hp instant kills from stealth. 
got nerfed due to the infamous DFG W RRR "combo". So if Riot ever did release such an item in the future, expect 
to get gutted after a month of LCS FOTM.
PS You forgot to list 
.
19 19 191 votesReduce it to 8% and 15% then things will be cool.
Lord Dusteon1 votesIt would be an extremely bad idea. AD Assassins (the main people who'd want this item) already have their combo AND autoattacks, giving them burst and some sustained damage. Giving them even more burst isn't needed (ADs can scale on AD, penetration, crit, and attack speed. APs can scale on AP and penetration (with a lesser extent on cooldown reduction)).
Ganja Pirates1 votes15% is very high considering the 75 AD already. Also, the poke capabilities of this item make anyone who's dominating a lane almost impossible to push back. If you're VS top is denying you farm, and every time you get close he hits you for 15%, there ain't much you can do to get your farm on. (me thinks)
