The political prisoners were released before a second mission was launched
On-curve, good early for smashing, good later to breaking out of board stalls, and plays well with others
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The deck wins by staying unpredictable, forcing opponents to respond to shifting threats instead of executing their preferred strategy
(For example, one could play Lugia to beat Urshifu but that deck is unfavored against Miraidon, Charizard, and Gardevoir, so its hard to justify bringing it to any major event.) The main threat to the deck is Mew VMAX, which has a decent matchup spread outside of Urshifu