Item idea: of a mix between 
and 
or a better item path for junglers build 
first item.
What do other people think?
It's kinda a niche item but I could see myself using it on certain junglers and might open the jungle up to some people that haven't traditionally been junglers.
Riot seems like they are determined to kill off hybrid items, and while I like your idea, it is highly unlikely that it will ever happen. :(
It's kinda a niche item
Extremely niche item.
There are plenty of hybrid damage champions in LoL - most of them use things like Feral Flare, Wit's End, Trinity Force, Sunfire Cape, Iceborne Gauntlet, and Kingblade for their damage though - none of which is focused AD or AP, but large, flat chunks of physical or magical damage.
The tankier a champion gets, the more hybridized their damage tends to become. Which has the nice design bonuses of making their damage very difficult to counter-build as an otherwise glass-cannon champion with a single defensive item such as Banshee's Veil or Thornmail. Hybridized damage is also extremely difficult to scale into end-game what with less than half of it benefiting from storng tertiary multipliers like critical strikes or Rabadon's bonus.
Currently, there are 2 types of hybrid champions:
Tanks and bruisers. Due to offensive items being really weak at scaling glass-cannon hybrid to meaningful places late-game, the massive cost-efficiency of things like Trinity force or Wit's end early (to offset their weak late-game synergy with damage multipliers), and the technicality that offense and defense do actually scale one-another's power (the longer you live the more damage you can deal), 1 hybrid item into mega-tank champions such as Udyr, Warwick, Nasus, Shyvana, Mundo, and more are one type of hybrid champion, and the biggest group. Understanding tanky DPS as hybrid champions also highlights a lot of reasons why glass-cannon hybrids really shouldn't be a thing. Don't beleive me? look at the physcial/magical damage inflicted by someone like Shyvana end-game. It's probably higher than expected, and really close to 50%/50%.
Glass cannon hybrids that force ability power and attack speed to actually scale with one-another. Kayle, and Teemo, and maybe a few off-builds of a handful of other champions. To a lesser extent, champions with decent incentives to build Trinity Force or Gunblade in Ezreal, Corki, Akali, and Katarina also fall into this a bit. Due to the whole %AP bonus of Rabadons, Lich Bane, DFG, or Critical Strikes, Life Steal, and penetrations in both cases clearly offering a stronger late-game with a committed AD or AP path rather than a mixture, these champions get 1 hybrid damage item (Nashor's, Gunblade, Trinity), and then pursue an otherwise committed non-hybrid build. Again, taking advantage of hybrid items generally being super cost-effective early due to their hybrid stuff face-planting 3 major items in.
Anyways - big problem with AD/AP hybrid items is that you're catering to the near non-existent 2nd type of hybrid champion, only ~2 of which ever tend to agree on what hybrid item to actually purchase.
The reasons for AD/AP hybrid champions not being at all common isn't due to a lack of itemization. It's because AD/AP has no end-game.
Also, non-AD or AP sources of physical or magical damage are just better for type 1 - as it allows the items to be cost-effective early and cost-effective with defensive itemization, making IceBrone Gauntlet's base AD AoE, Trinity Force's base AD crit, Wit's End's magic damage on-hit, Kingblade's %current HP on-hit, Feral Flare's magic damage on-hit, or even Sunfire Cape's level-based AoE much better mixed damage sources for actual hybrid damage champions.
How about we make 
all use 
instead of 
This would give junglers 20% spellvamp and mabEy add a 2-8% of damage delt by attack and abilities restore 2-8% of your mana.
