Classic cards such as Massacre Wurm (creatures your opponents control get -2/-2 until end of turn, and then opponents lose 2 life per creature that dies) or Elesh Norn, Grand Cenobite (creatures you control get +2/+2, creatures opponents control get -2/-2) often destroy aggressive decks, especially if brought into play earlier than normally expected
Card draw synergistic giants like Niv-Mizzet, Parun and counter doublers like Tekuthal, Inquiry Dominus cause additional shenanigans than just drawing cards in reverse
It doesn't copy whether Ran and Shaw are tapped or untapped, whether they have any counters on them or Auras or Equipment attached to them, or any non-copy effects that have changed their power, toughness, types, color, or so on
Bronzong 067/131 Loading
So for decks that play with Mewtwo & Mew-GX UNM 71, it is obligatory to use the Stadium Chaotic Swell CEC 187
Giving a gift in Commander can even be pure upside, giving you a little political sway to go with your removal