An early Gardevoir ex list that incorporates Mewtwo V-UNION. Mewtwo generally improves your matchups across the board, but it's particularly useful against Lost Box decks. Ideally, you'll set up Mewtwo and Roxanne the Lost Box player at 3 Prizes. Then, you can KO your opponent's Comfeys using Mewtwo's Psyslposion attack, which spreads 16 damage counters. Using Roxanne and KOing Comfeys (hopefully) prevents the opponent from using double Mirage Gate to power up Drapion and OHKO your Mewtwo.