User blog comment:Willbachbakal/(Item Concept) Revamping Life Steal/@comment-24795478-20150825144017/@comment-1330314-20150825145427

There is none. My version of crit is basically a kind of modifier to your third strike (basic attack or spell). Since crits would then be able to apply both on basic attacks and spells, it would be completely independent from life steal, and so this version of life steal doesn't depend at all on crit.