Pros:
+ Delete ADCs with Night Harvester while screaming "Welcome to Season 11 *****"
+ Strong wave clear with your E
+ W Damage Reduction can reach over 90% basically making you immune to AD champs
+ Keep your Sustain with BOTRK
+ Strong Teamfight Potential

Cons:
- Q doesn't do a lot of damage once mid-game passes as you aren't building AD anymore
- Weak 1v1 Potential
- Squishier than the standard Irelia build (have to play safer)
- Might get reported if you feed

It seems to, however, you MUST win lane. If you don't you will fall behind very quickly and become a cannon minion. Here's an example.




Because of this, AP Irelia is very volatile and very difficult to use. However, when it works it is far more fun than standard Irelia, especially when you casually delete 3 people on their team with your Ult.

AP Irelia excels at flanking their backline, unlike the standard irelia where you often follow up on an engage from a Tank on your team (such as Malphite), AP irelia likes to go around the side, ult the support and ADC and complete take them out of the teamfight which is why AP Irelia can be incredibly strong, however, if this cannot be managed your best bet is to E1, ult, Q through their team and E2, Q their ADC to try and kill them.

Thanks to BORK, lane is not as difficult as you'd think as BORK works really well on Irelia and is basically a core item for her at all times.

Before taking AP Irelia into ranked, I suggest practicing the build in Draft to get the hang of the different playstyle you have to take on. You are no longer a frontline Fighter/Bruiser and instead an assassin.

Hope you enjoyed this guide! I will be updating it frequently along with my other one. Good luck on the rift.