I want a hybrid item that provides armor and magic pen please

(side note: I'm irrelevant, so this post probably is too)

I'm a fan of most champions who do a lot of mixed damage, but at the same time I wish I could make both types of damage as effective as possible with more item selection. i don't want to have to use two entire item slots for two types of penetration. I mean, there are hybrid runes (magic+armor pen) so why not add at least one new item that adds both types of penetration.

Build path could be + which is good in two ways. 1, being that it would be an item that provided penetration for hybrids and allows better itemization for hybrids and 2, being that is gives another build path for both haunting guise, and brutalizer .

Of course though, this wouldn't really be a good item on most champions since they are either mostly/pure ad or ap, but for champions like shyvanna (tons of mixed damage regardless of what you build), jax (obvious), kayle (more build options rather than just AP kayle), and could even option up options for non-meta builds like hybrid ezreal/miss fortune/etc.

The stats on an item created from (25 AP, 200 hp, 15 Magic pen, cost 1485 gold) and (25 attack damage, 10% CDR, 10 armor pen, cost 1337 cold) would just be something like this: +35 AD +35 AP +250 HP +15 Magic pen (Unique) +10 Armor pen (Unique) +10% Cooldown Reduction (Unique) and could probably cost around 3000 gold, which would make it about 121% cost effective (1260 for Ad, 761.25 for Ap. 667.5 for health, 120 gold for armor pen, 514.95 for magic pen, 316.7 for cooldown reduction). Now, I'm not entirely familiar with cost effectiveness of most items so that might be too much, taking away 5 ap and ad would make it around 108% cost effective if it is too much.

TL;DR --- I'm not smart, want new hybrid item that has armor and magic pen, suggested option that builds from haunting guise and bruitilizer that is about 121% cost effective.