Okay, so it looks like I have to be that guy again, but I have to clear up another ruling in light of the recent duel.

[hider=Duel Spoilers]
[b]"I..."[/b] Tsukiko said as the dark energy enveloped her body as she tried to activate Polymerization. She swore she could hear a voice though it might just be in her head. She had a new good strategy, but she now understood what Shiyura was trying to warn her about. Unfortunately, it was too little too late as the card was inches away from the Duel Disk by this point. Tsukiko felt a force take over her body when she hesitated too much where it was going to force her to play the card. She had a wide evil cold smile on her face as her eyes looked like they burn with flames of destruction. [b]"This is the void and I will drag you right into it."[/b] She said as she finally revealed her Spell Card which was Polymerization and held it up into the air. [b]"Dragon of the flames of destruction come forth. Burn forth in ashen ruin and return everything to the void which it was bathed from! COME FORTH MY SERVANT OF DESTRUCTION, VOID TWIN DRAGON!!!"[/b] A dark vortex ripped into the sky where powerful shockwaves could be felt by both players. Out of the darkish black and red flames emerged a dragon which descended toward the ground. 

[b]"The end is nigh."[/b] She said which didn't sound like her at all. It actually sounded like something had taken over her body and now it was dictated each one of her moves. The surges of pain weren't over for the girl's body, but by this point, it had gotten past the point of caring. Another card flared up inside their hand, waiting to be played. [b]"They say the more merrier."[/b] She grinned as she revealed her second card was Overload Fusion and held it up into the air after she discarded Polymerization into her graveyard. A second dragon appeared right beside the other one as she banished the two Void Dragons in her graveyard. [b]"This is what I warned you about. You were too naive to listen. But what would you know about pain? Is that you care? Or is that you are trying to impress people by caring?"[/b] She then switched Twin-Headed Behemoth to attack position.

[color=a36209]"I activate thunder king rai-ohs effect"[/color] Vincent said as the monster turned into a glowing balls of sparks. [color=a36209]"Because you special summoned one of your void twin dragons this turn. Thunderk king rai-ohs effect allows me to destroy it"[/color] Vincent said as the Ball of lightning formed from what remained of the thunder king hurtled towards one of the void twin dragons. 
[/hider]
[url=http://yugioh.wikia.com/wiki/Card_Rulings:Thunder_King_Rai-Oh]Thunder King Rai-Oh[/url] cannot actually negate Special Summons by Polymerization or Overload Fusion, because it cannot negate Special Summons caused by another card effect.