Notes & Combos
Reached Diamond V with this deck in November. This deck started with my favorite archetype, Kozmo, and realizing that it containing only LIGHT/DARK monsters, that can benefit from banishing, would go well with Chaos monsters. It needed ways to dump monsters in the GY, so I naturally went for a 60-card Grass deck, adding Snow, Destrudo and Reasoning among other cards that go well with that strategy. Then, the small Thunder engine that also has synergy with LIGHT/DARK monsters being in the GY or getting banished. And lastly, the small Lightsworn "package" to have another way of dumping cards in the GY, and Raiden is actually a nice tuner to get Chaos Ruler. Definitely a go-second deck, can break a bunch of boards thanks to the varied removal effects, non-linear play patterns, and confusing the opponents with cards they've never seen before.
Top Secret Packs used

Just wanted to express my appreciation for this list. I don't play kozmo but I'm labbing a Gizmek strategy and you've given me a lot of ideas! thanks :)

Thanks a lot! This deck is the most fun I've had playing Yu Gi Oh! and after getting to Diamond II before the end of this season, I might just try to go for Diamond I next month! Also, I thought I recognized your name, and I actually used your Vaylantz deck post to build them and learn them, so thank you for that too!