[We all know what will happen so lets skip to the end and save characters]

Yami: 2000 LP
Monsters:
Dark Magician: 2500 ATK
Black Luster Soilder: 3000 ATK
Dark Magician Girl: 2000 ATK
Spells/Traps: none
Face downs: Mirror Force
Hand: none

Alex: 200 LP
Monsters:
Barrel Dragon: 2600 ATK
Spells/Traps: Solem wishes
Face downs: Dark Bribe
Hand: pot of greed, blowback dragon

Alex:(He's beating me. Deck if you can hear me, please answer my call.) My turn. I DRAW! [Polymerization] (Yes.) I play pot of greed, so now I can draw 2 cards. Next I play Polymerization and fuse the Barrel Dragon on my field with the Blowback Dragon in my hand to create: Gatling Dragon. Now I activate his effect. I get to flip 3 coins and then destroy cards on the field equal to the amount of heads I get. (Here we go.) [3 heads] Alrighty then. I destroy all 3 of your monsters. NOW! GATLING DRAGON! ATTACK!
Yami: I ACTIVATE MIRROR FORCE!
A: NICE TRY BUT I ACTIVATE DARK BRIBE! THIS NEGATES YOUR CARD AND YOU GET TO DRAW 1 CARD! FINISH THIS GATLING DRAGON!

A: Yes. I win. Next time Yami: Don't go easy on me.
Ya: Very well. I trust you. I could see your face focused, as if you were asking the heart of the cards to help you.
What happens next?