User blog comment:RoznosicielCiast/Is Siphoning Strike too strong?/@comment-5686533-20131105105303/@comment-5824171-20131106001405

Baleful strike gives bonuses to AP, which affects -ALL- his abilities. (Bar the stun ring.) Because of this, his ulti reaches ridiculous damage in a drawn out game, as does the meteor. He gets a considerable amount of power late game. Not gonna sit here and do the math of farm to power and ratios and blah blah blah but since Nasus gets only 1 skill with unlimited power and Veigar gets 3, I'd put my bet on the mini-mage. Plus, nasus doesn't get a 30% increase to siphoning strike with one of the standard items for his build. Veigar does. The moment you put the rabadon hat on, Veigar hits pretty dang hard.

Next, push potential. Siphoning is single-target. Baleful strike is too, but since it's AP as opposed to "Power buff on this one single skill", it affects the meteor and can cause it to be a pushing force to be reckoned with. Cooldown may be a bit long but tbh, Nasus can't push nearly as well without getting a hydra. Remember this game isn't all about killing champs.

And for the bonus round, here's the final scoop: Burst. A well-farmed Veigar can pretty much pick a target, any target, and burst them down. Either the burst will kill it or the subsequent baleful strike coming in about 3/4 seconds will finish the job. It may be one target, but hey, so's Siphoning, and Siphon doesn't have an AOE stun for teamfights. (A wierd to land one but still a stun.)  Siphoning strike is one hit of immense power, Veigar's burst is MUCH higher damage potential because it's one ulti of immense power, a mid-power (Admittedly difficult to land, but it's not rocket science that it's to be set up with the ring of stun) meteor and the lowest, but still none too shabby power of baleful. And the sheer power of this burst is made all the more terrifying by Veigar's infinite AP potential because of Baleful Strike.

So if you try to persuade me that the stacking on siphoning is bad, my reply will be "What? I'm sorry I can't hear you over the mini-mage laughing."