The Normal Monster "Harpie Lady" and its first four Effect Monster retrains ("Cyber Harpie Lady", "Harpie Lady 1", "Harpie Lady 2", and "Harpie Lady 3") are considered as the same card when constructing a Deck: a player cannot use three copies of the original "Harpie Lady" and three of "Cyber Harpie Lady"
Earth Scrap Wyvern LINK-2 2 monsters, including a "Scrap" monster You can target 1 "Scrap" monster in your GY
It doesn't have to be attacking the same player, planeswalker, or battle that the non-Human creature is attacking
Since so many cards in this deck get you to what you need, the consistency is infinitely high, and thus, the deck saw tons of play throughout the year
Because the X and Y era expansion included a reprint of the incredibly valuable Base Set Charizard from 1999, many collectors rushed out to buy the 2016 release as the "next best thing" due to the retro card's scarcity