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And finally they show that determining whether one player has a winning strategy is equivalent to the famous halting problem in computer science

At Central Park, Sora taunted Yuto about Lulu's fate, claiming that he would hunt down all Xyz users like Yuto, and suggested that destroying Fusion users would help get Lulu back

Any effects that say that the Human can't attack (such as that of Propaganda, or if you get a Human with defender) affect only the declaration of attackers

Phasing Phasing is a mechanic that was so misunderstood by the player base that it would largely, um, phase out for more than a decade until Teferi's Protection in Commander 2017