There are many problems I have found playing against an AP yi

Here are some:

1. He can easily heal while being attacked by multiple champions and a turret without taking as much as a scratch. Now it is true that you can easily disrupt this to stop it. But since this is not an ultimate ability and is an ability with a relatively fast cool down it makes it impossible to play a game without having to construct a team that is specifically tailored to counter AP yi. It would be much more understandable if this ability was an ultimate because then you would understand why it is so powerful and you would have at least one person to deal with it. This is like having a mundo ultimate every 35 seconds.

2. His Alpha strike when going AP becomes very high damaging. Since this ability causes him to become untargetable and to leap across the battlefield in between enemies and landing near one it makes this ability almost ultimate material also. His Alpha Strike is like having a Fiora ultimate every 10 seconds when it is maxed.

3. Lastly the mixture of these abilities and his ultimate make him almost impossible to kill. If he cannot kill you in a fight his ultimate almost always guarantees him an escape and if he kills someone while it is active it automatically cools down all of his abilities causing him to be that much more difficult to even fight in 3v1 to 1v1.

He uses lots of mana to spam his alpha strike, He needs to get in too close when he does attack you for most mids you'd be able to poke him for a lot of his health which he meditates back. Just like Yi is a rare unique mid you have Fiddlesticks. Fiddlesticks has a drain to get his health back from Yi's pokes, Long range poke that silences while killing his minions and stopping Yi from meditating and a fear which also stops him from meditating and when you stop him from meditating with CC he still uses the mana so you'll be zoning him all day long. Fiddlesticks mops the floor with AP Yi.

His heal is, I think, the highest cooldown basic ability in the game. 35sec is a long time.

You don't have to construct a team to counter AP Yi. Every team should have at least a few sources of hard CC. The fact that some champions are particularly effective at providing interrupts just means that they're good counter-picks.

Or riot you could just mix meditate with wuju style then give him a new ability.

Wuju style:
P: gain ad
A:just heal small% of ap no standing around, gain small def buff, and double the ad gain for a couple second. problem solved

so he does like 600 damage then dies, whats the problem?

Grievous wounds: Either use Katarina or Fizz for their reduced healing abilities, or buy a Excecutioners Calling or Morellonomicon.

Consider someone with some good CC. Like Diana, Fiddlesticks, Soraka, Cho'Gath, Kassadin, Malzahar, etc.

All of these negate his Meditation.

Building MR doesn't go astray, either.

1) No. Not only can one CC stop his heal, but after his heal is done he won't be healing for 30 seconds after. It does NOT have a relatively short CD. It's hella long. Smoking dope, son.

2) Alpha Strike is his one and only attack as AP build. His ultimate is only good for resetting his CDs, and that's ONLY if he gets a kill while it's up. Otherwise, nothing happens.

3) I assume you only play slow spammers, which is your bad. His ult only blocks slows. It doesn't even stop roots. Expand your champion horizons.

Stop being bad and maybe you can play against him. Seriously, AP Yi is a weaker version of Katarina who pushes lanes better. Katarina is way better at cleaning up fights than him.