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The translations and subs were the work of 'GX_ST subs', and I do not own Yu-Gi-Oh! Duel Monsters.
Some basic info to contextualize the clip:
Episode? 162
Why is Yami Yugi (the pharoah) overkilling Weevil? Weevil presents a card to Yami , claiming that it's the card that sealed Yugi's soul... only to rip it to shreds. Yami gets really ticked off upon realizing that Weevil's act was but a stunt.
How did Breaker reach 1500 ATK points when his original attack was 1600? Weevil activated a trap card, "Insect Swarm" that decreased the ATK of all monsters on the field by 100 points, and both players lose 100 life points for each of their monsters affected by "Insect Swarm".
Soundtrack? Ironically called "The Fang of Critias"