You can't touch an AP yi early laning. He Q's the closest minion, and instantly runs back, and by the time you are hit, he's 2000 range away.
And Fail for trying to mention specific 5 person comps that counter ONE hero. That doesn't make him non-viable, it makes your example extremely low probability. Plus, CC is the reason why I advocate for cleanse in my summoner spell section.
You Q in, they drop 5 CC's on you, you pop cleanse, R out, W heal at safety and laugh as all their CC was just wasted while my team rips them apart (and I myself Q back in).
And you don't need CC as Yi. If you want CC, grab a red buff and slow their entire team in a microsecond. Corki also has no CC, does that make him non-viable? I don't think so. He's quite a dominant carry and high ELO.
And if you are talking about AP per second comparisons, try calculating how much AP per second a 1:1 ratio Q nuke is, with an instantaenous 1:1 lichbane proc, followed by an hero dying and an instantaenous Q again. That's 3 AP in a microsecond, and it happens A LOT. Then you pop R and 2 seconds later you get another 1:1 AP lichbane procs, which kills someone, and you Q again. So in 2 seconds, you get 2 lichbane procs (one at T=0, one at T=2 sec), and four Q's. That's 6.0 AP in 2 seconds. Nobody comes close to that.... and that happens... a lot.
Anyone that thinks Q has a 6-8 second cooldown simply has no clue. I pop 2-3 Q's within the first few seconds of a teamfight if my team has good focus fire. Their whole team is in the 25% range in a few seconds. Maybe you are playing bad Yi's that aren't taking advantage of R refreshing Q. That's a huge difference in dps... like 200-300% in burst scenarios.
BTW, I'm trying really hard not to just come blindly countering stuff, but I do have to speak up against blind generalizations that blatently aren't true. To me he's one of the safety heroes in the game - at least with cleanse to break CC's, and R to ensure you get out - and that's not even mentioning flash. He's BEYOND safe.
I kinda like AP Yi's early game more, but AD Yi's late game more.
The solution is thus to play like this early game with a meki pendant, get a chalice and boots, then take AD items. Alpha strike first priority, meditate second, you can probably leave both at 4 while you max out Wuju style.
Yes, I've played AP yi. Yes, he can deal ridiculous damage with, and probably the key point, a lichbane. The thing is that if you build him mostly damage items(except with the chalice I like to have to semi-spam alpha strike and meditate), you have much safer sustained damage that tends not to rely on you killing someone with an alpha strike + lichbane.
Both Yi's can get focused down with focus fire just like anyone else, the difference is that an AD yi deals just as much damage in a more sustained way.
Also for the record, cleanse doesn't provide you immunity to being burst down in an instant as you run in there, and really only newbs would use five crowd control effects on you at the same time.
The reason that we frown on AP Shaco and Yi is because they are kind've gimmicky. When people try gimmicky things for the first few times after hearing about it, they are likely to do VERY bad. We have all seen TERRIBLE AP Shacos, and a select few good ones. Not only have I never played with/against a good AP Yi, I have never even seen a bad one. As such I can't (rather shouldn't) speak ill of something that I have only heard theory on (and more than likely exaggerated theory at that)...and neither should any of the others who read this thread.
In theory, it sounds like it could be viable as long as your team understands your role prior to the match.
In regards to the OP's comment about the stunlock team...its never just to counter one person. People play it all the time, and push people's feces in with it. Even your precious cleanse would not save you then...because if a stunlock comp wants you dead, they will feast upon your soul.
From reading your guide, it sounds that your team usually has quite the upper hand in initiating team battles. I'd just like to remind you that although AP Yi may benefit more than your usual casters from bursting a few guys to refresh your cooldowns, I can imagine some situations where you don't get a kill fast enough, and you don't do enough burst damage during the crucial first few seconds of a fight.
Imagine if Malphite or Amumu initiates on top of your team, you Alpha Strike and R, there's tons of CC you cleans run out and no one is dead yet because its messy fight. Now compared to other casters, you won't be able to add that extra amount of burst that kills the first guy. In prolonged fights against tanky teams, I have a feeling you won't be able to perform that well because you're waiting for Q to cooldown while your team gets gets raped.
Also, Mejai's can kind of distort the story you're telling. I'm not sure what skill level players you're fighting against, and because of this I'm slightly skeptical about your OP claims. If you've outskilled your opponents up till now, then Mejai stacks can distort much of the builds effectiveness. Against smart players who give you few kills, AP Yi may fail hard without enough stacks, since you're relying entirely on one AP skill. Kassadin is one of the few heroes who can pick up and preserve the Mejai stacks effectively in a more competitive environment, and somehow with AP Yi I imagine it to be much harder to sustain.
However, let me say that this build does have some semblance of practical viability. With smart use of Cleanse and Flash, W and R, AP Yi has something that nearly all the casters don't have, mobility and sustainability. I can see how the combination of Flash, Cleanse and R will make you an insane pain to kill in team fights, especially with a tank around. Coupled with heal, you can make comebacks in team fights pretty easily. The only problem I see is the burst if people don't go down fast enough and you don't get any cooldown refresh.
Also for those who are skeptical of the heal, I think nearly all heroes will not be able to send Yi home in a 1v1 lane, unless Yi wants to go home. With enough mana regeneration I think solo Yi definitely has a strong lane presence. However, your mana can be stretched if you're forced to spam Q and W to keep up against a well built soloist, I'm not sure if you're mana regeneration can hold up against high and sustained usage. The solo Xin is a pretty good example, he will be healing as he attacks creeps, so if built right I think he can and will stretch your mana really far.
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