hey null and void question right here

There doesn't seem to be any clear reason othe than the fact that Null and Void is only looking for an effect that Draws and does nothing else. Notice the first ruling for Null and Void:

You can only chain "Null and Void" to an effect that draws cards and does nothing else. You can chain "Null and Void" to the activation of "Pot of Greed" or "Jar of Greed". You can chain "Null and Void" to the activation of the effect of cards like "Airknight Parshath".

So there is no technical reason. It's just how this paticular cards is to function.
 
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