They can beat you at your own game by generating too much value in the midgame, and always having some gas left in the tank after any number of Thoughtseizes and removal spells
The deck places a lot of importance on Mask Change which can be easily searched by Elemental HERO Shadow Mist but without any way to actually special summon him, HERO decks like to run Goblindberg and Call of the Haunted to make up for that weakness
Cards like Black Lotus, for example, which generate three mana for zero investment, offer an unparalleled tempo advantage that defines the pinnacle of the MTG power level
Having this Mewtwo in a collection recalls the 20+ years of the Pokmon TCG
Harpie Perfumer Harpie's Perfumer is able to add a spell or trap card to the hand that mentions Harpie Lady Sisters upon summoning, of which there are plenty
Activate your effect!" When Yuma and Astral activate that monster's second effect, Yuma announces "The Xyz Monster summoned using Gagaga Head uses its effect!" When Yuma and Astral Summon "Gagaga Sister", Yuma announces "Gagaga Sister