no way in hell. the problem is that void rays are already arguably OP, I remember seeing how hilarious it was in custom games that every single last damned one of them when void rays were allowed to be purchased or whatnot, devolved into who got void rays first. Anyone else who didnt get void rays usually lost to those who did.
With that situation as it is like i described above, ANY boost to the damage void rays can do makes them OP IMHO.
It's just bad for the game as a whole if void rays are that good. If you're a toss, you should get void rays. Every game where you play a toss, you know he'll go void rays if he's any good. Every game with a toss involved will come down to whether he can survive long enough to get void rays and when he does it's likely game over.
It's like if you play MTG with no rules and access to every card, what a surprise: everyone has dual lands, 4 black lotuses, and a billion moxes. Then throw in 4 fireballs and wait until you draw one, do 20 damage and its game over.