Meddler lets make rageblade a proper hybrid item
Take the same build path.
+35 AD +40AP +25% attack speed passive: On hit deal 15(+15% bonus AD)(+7.5% AP) magic damage to your target Unique passive - Guisinoo's Rage: gain bonus AD equal to 30% total AP and bonus AP equal to 15% of bonus AD, gaining a stat of rage each basic attack(max 6). Each stack gives +3 AD, +4% attack speed, and +4 AP
For the phantom hit passive that seems to have been in a state of too good on it's own (good ol' devourer with built in 60 on hit damage with the phantom hit inflating that further), or a useless niche save for basically otherwise abuse cases (attack speed cap breaking kog, and current kayle with this current rageblade). The passive would be enjoyed on a lot of champs, but maybe you could consider putting it on an item without an on hit that rivals base AD in it's premitigation damage on most champs mid game.