U can replace em with ritual, fusion or trap card u have but thunder dragon is so handy they can thicken ur deck and save you from trouble especially against kaiba
I can confirm this deck works, I got 5k. Had to replace enemy controller with windstorm, mirror with reinforcements, and dragons/poly with other deck thinners like blacksmith, shard of greed, arsenal summoner (and a guardian).
It's pretty budget, if you don't have them then you aren't ready to farm Kaiba. He's the hardest LD in the game so go farm other stuff and work your way up.
Benny
Daemon Blitzkrieg
