Zeke's Harbinger and 100% crit builds; change that to 50% crit DAMAGE

It's not all that uncommon to see 100% crit chance hypercarries these days, and Zeke's is apparently only worth taking when your ADC is a duelist that builds Maw - Deah's Dance - Phantom Dancer, aka the opposite of the intended user. Now having the intended users swap from one category t oanother can have 3 effects:

• be overpowered on the new users (tank itemisation these days)
• be totally fine and just as interesting
• be completely unusable on the intended users, BUT too situational/unrealistic on the new ones. We're in the 3rd case here: Graves and Quinn won't be with their support enough to proc Zeke's, as simple as that. They'll get picks together, they'll teamfight together, but they'll spend most of their time roaming at 2000 units from their support at least.

The item is pretty much useless IMO.

So why not change it to 50% crit damage instead of crit chance? Pros:

• Works best on hypercarries with 100% crit
• Is multiplicative/snowbally like the AP counterpart of the active. Currently, you can make someone go from 0 to 50% crit chance, but if someone has 0 AP they remain at 0 AP.

Thoughts? Number (50% crit damage) is obviously subject to change, it could also be a weaker version that procs faster for example.