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Shaddoll cards had a history bouncing on and off the banlist, with all of them now unlimited

CYHO-JP030 Shuuen no Haoh Demise / Demise, Supreme King of Armageddon Level 10 DARK Fiend Ritual Effect Monster ATK 3000 DEF 3000 You can Ritual Summon this card with Endless of the World

You have Galaxy Cyclone, a great removal spell that stops back row strategies

The monsters that come out in the recovery also have his negate effect, which has a high RBI, but it's pretty tough in a synchro deck for him to spare a deck slot for something you don't know if it will come out

Master Duel caps the number of identical cards you can add to your deck at three, and because you can add the same card to multiple decks, theres just no point in having more than three of the same card