Last Updated: July 9th 2018
Short Answer: Probably Not Worth It!
Mejai‘s grants +4 stacks on Kill, -10 stacks on Death, +2 stacks on Assist
We‘re about to rule out one of the most contentious on-going topics in League of Legends: Is Mejai‘s worth it??? Most likely not. Here is why.
First, let‘s have a look at our KDA in our match history
Bjergsen‘s match history: All the games but the Galio and Leblanc games would have given him less than net 10 stacks for Mejai‘s
The following inequality must satisfy for Mejai‘s to generate any positive net stacks: 4*Kills + 2*Assists > 10*Deaths
Here are some examples:
Those are just common "decent score" examples and as you can see you don‘t end up with much stacks most of the time.
Well, of course, if you had bought mejai‘s at 0/5/0 and then ended 5/5/0, then that‘s a different story as that means you have not died even once after the purchase.
But here‘s the catch: Even if you do reach high number of stacks (e.g. 20 stacks), it usually tends to be short-lived. You are always susceptible to deaths and once you die, you lose 10 stacks.
People often overestimate the amount of time they stay at the peak amount of stacks. In reality, the average amount of stacks during their possession of Mejai‘s is very low.
+ 200 Mana (280g)
+ 20 Ability Power (435g)
= 715g
Mejai‘s requires 6.3 stacks (31.5 ap = 685g) to break even with the cost of its basic item counterpart.
Not bad, but how does Mejai‘s fair with other completed items?
You really need to be honest with yourself
For every death you would need the following to maintain your stacks:
This is not so easy as it requires at least 3 enemy champions dead
You will most likely have to have won the team fight to achieve at least 3 takedowns
The chances are that if your team is losing or you tend to die a lot then this item is not for you
