User blog comment:JmLyan/Zenbakia, the Number Master/@comment-5412516-20130620011821/@comment-7481207-20130620105848

Innate - Doesn't display damage against minions, so it doesn't help last hitting.

Q - Zenbakia gains the stacks and it has no cap, though he can lose them quite easily since he loses all of them upon death or if he casts it on someone else.

W - Doesn't scale with his own AP unlike Veigar's ulti, and 240 base isn't that much. The AD scaling is bonus AD, so only against hybrid builds does it scale with both.

E - You cast Plus and it goes on cooldown. Then next time you cast it you cast Minus instead and it goes on cooldown again. Then Plus and so on.

R - It can't really kill steal, as it only "takes" the kill if the champion is executed (dies from minion, monster or turret). If one of your champion kills the target before Final Countdown does, you don't get the kill and the mark disappears. The reason it's initial cooldown is high is too avoid abusing it in lane.