User blog comment:RoznosicielCiast/Is Siphoning Strike too strong?/@comment-5686533-20131105105303/@comment-3974211-20131112020813

It's the age-old argument of spell-DPS versus attack-DPS.
 * Veigar will always be squishy and has cooldowns - the dream of tank-Veigar who farmed enough AP to still be a mage has never happened.
 * Even while Nasus' Q is on cooldown, Nasus himself is never on cooldown on account of being an AD-champion with an up-to-300 AD steroid on.