To answer your question, the wild card upgrade late game is due to the fact that the ap ratio on wild cards is very low along the later levels, you can do much more damage early-mid game using a level 1 wild card than you can at level 5 (unless you've been overly fed and rushed a Deathcap of course).

Note: This is only MY playing style, i definitely encourage others to try out my build and leave comments/criticisms here as well as sending them to my email. KyoJinXVI@gmail.com

late game?

if is an ap build why wild cards upgrade

nice build, i'm also loving the rageblade/malady combo on twisted.