There were no good answers to a Frenetic Efreet, only answers that worked half the time, so as long as you weren't far enough behind that he was ignorable the Efreet was always effective
Even more importantly, the untap ability allows them to generate tons of mana for explosive turns while turning Gwenna into a hefty threat
Like many past Pokemon games, the new Pokemon Legends Arceus lets you choose what your trainer is wearing during the game, and to do that you will need to know how to buy clothes and change outfits
Free cards or spells cast is powerful, and she churns cards and card advantage powerfully, so folks load her deck up with cheap or free cards with big costs, like Peregrine Drake or Palinchron as well as tons of instants, like the free Snap or Frantic Search, and such
Endless Punishment deck features strong removal options and life manipulation with Valgavoth