3000+HP, 800+AP, 100 or so resistances, and void gate passive.
Keep in mind maokais W has a TON of %HP damage on it. you can easily hit 40% with a high AP build - sub out zzrot for that lichbane, and you could do actual squishy oneshots. your chase would also be fantastic because hextech GLP+W+Q+ good Es means they simply cant run away.
M-pen maokai is also a thing, and its pretty scary. As scary as Mpen nasus or morgana.
... Also minor nitpick. Its maokai. Not Mao'kai. the (word)'(word) is a reserved naming device for void champions.