Talk:Master Yi/@comment-83.161.206.168-20121210131018/@comment-2.124.176.247-20121213135919

Why do you think an AD will have high scaling AP on a move? In MOST cases (obviously Yi is an exception) the high scaling isn't enough to allow the champion to build AP rather than AD, but what it does do is allow small amounts of AP on items, such as trinity force, champion abilities like Lulu's W, and support items, like Will of the Ancients, to not be entirely wasted and to still help to some extent.

Lets say AD Yi builds a trinity force. This has 30ap on it. Rather than be an entirely useless stat, it gives him 30 extra damage (10% more than max rank base) on his Q and a maximum of 120 more heal on his W. These numbers aren't broken, but they stop the stat being wasted entirely.