yu gi oh dark world structure deck Yu-Gi-Oh!: shaking Structure Deck DARKNESS RETURNS WITH STRUCTURE DECK:

This Level 8 Synchro Tuner debuted in Japan as an OCG Structures promo in October 2024 and has never seen an English printing until now

(This is treated as a Fusion Summon with "Fossil Fusion".) During your Main Phase, except the turn this card was sent to the GY: You can banish this card and 1 "Fossil" Fusion Monster from your GY, then target 1 "Fossil" Fusion Monster in your GY

I wanted to put Exchange in a deck, so I was thinking Chaos Warrior with Thunder Dragons would have be the right choice

While cards classed as Forbidden cant be used at all, Limited and Semi-Limited cards can be used - albeit with restrictions on how many copies of the same card can be included compared to the standard limit of three copies of any one card per deck