What if they also reverted Trinity Force?

Go back to Zeal+Phage+Sheen, and give it back the crit chance. Since Essence Reaver no longer has anything to do with crit, we don't have a mana item for crit users.

But as a stipulation, I'd also want them to change how Sheen works. Instead of just adding damage to the attack, the spellblade attack should be a guarantees critical hit (with the same scaling). This would allow Randuins to work against it, instead of just attack speed crit builds.

Stormrazor's would probably be best removed with a change like this, but that item wasn't really well thought out to begin with.