Suggestion: Tanky Crit item ( 0.25 crit for every 2% missing health up to a maximum)

similar to maw of malmortius As title says: You'd get +0.25 crit for every 2% missing health up to a maximum of 10. (this is what would set it viable for tanky dps champs as opposed to ever seeing a marksman use it). Since the best way to make the most use of it would be by being able to stay alive with low health.

this would be for typically hybrid bruisers like udyr, shen, xin zhao whose spells do not necessarily scale well with ad but rather benefit from applying crits with the attack speed buffs they get from their kits.

I also think this would open up a lot of options when paired with crit runes (this item would be built with crit runes in mind). On a tank about 15-20% crit is pretty fair especially considering they aren't getting more items that would amplify the crits. their crit damage will likely range around 350 dmg while remaining tanky.

A hypothetical build would have guinsoo rageblade on shen as his only dps item, 10 crit from runes (9 marks 1 quint). And this tanky crit item. One possible recipe for the item would have seeker's armguard combined with phage. final item would give 20 ad 25 ap 50 armor 300hp and the two passives. crit and phage movement...

having it pair with phage would make it less cost effective to build it in tandum with trinity force however which could be good or bad.

other champions this item could work well on are gnar, sion, rek sai, jax (anything goes on jax), perhaps on; poppy, nasus, shyvana, gp, warwick, chogath evelyn. I'd say nautilus cause his passive can crit but his attack speed is horrible.