Works very well....5 duels - 5 wins
Just remember to do in the last roud:
1- use storm to clear the spell & trap card zone and bring your Labyrinth Wall in attack position
2- then use sword and shield
3- special summon The Fiend Megacyber
4- normal summon GK Vassal
5- done!
This deck works against Kaiba 40 also. But sometimes he summoned BEWD in the very late turn, and left with only two monsters on his side of the field, the Fiend Megacyber cannot be special summoned as a result. However I still won with 5K damage from vassal + Labyrinth with 2 Union Attacks.