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I chose to add Palkia EX (EX) to help this deck deal with Dragon types like Rayquaza EX (EX) and Black Kyurem EX (EX) more reliably

Every color has at least one good one and having a creature that's capable of fogging every turn, blowing up every Artifact or every Creature or in the case of Divining Witch, just being another way to win with Thoracle means people might not overextend into a threatened wipe, conceding you a bit of tempo advantage

Theres also the fact its actually an excellent card, giving you a one-mana 1/1 with Haste that you can pay to make it mostly unblockable

Red-Eyes Black Fullmetal Dragon