A combo deck based on Chain Material. The idea is to spam out several HERO Fusions and then Xyz Summon with them, or fuse using Fusion Gate's effect instead of Chain Material's effect, so you don't get hit with the End Phase destruction effect of Chain Material.
One of the cooler cards you could run for a deck like this is Coach King Giantrainer, but that requires playing a later format/card pool. It combos really well with Chain Material since you need to get rid of your Level 8 Fusions anyways and Chain Material already prevents you from attacking that turn. I definitely recommend running 3 Chain Material in a deck that uses Giantrainer so you're able to summon it more consistently.
This deck is one I used to play a lot back in the Dueling Network days. It's not particularly good, but it's pretty fun!
Uses the March 2012 ban list.