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Isn't this what I always do, set massive limitations to come up with a creative deck. Hell, I've made not only decks that use one rarity, but I've done it with cards that are neglected (Tyrant Dragon, Hiita, ect.) Damn you Konami! You stole my idea!
A friend of mine runs Trident Dragon in his dragon deck. It's pretty fun to go up against. Have to use my Fiend decks, though, cause my only other deck's a dragon one, and the Field spell is Mountain. Giving Trident 200 extra ATK and DEF? ;-; My dragons are screwed. Unless I can get Darkness Dragon to a higher amount of ATK, which is very, VERY difficult to do.