It gives a player a way to put cards from their graveyard back into their deck, possibly recovering important cards, and then lets them draw a new hand of seven fresh ones, perfect for if one has more mana than useful cards prior to playing Timetwister
After Neo Destiny in 2002, they returned in Shining Legends in 2017, and thats about it
Since we barely play any abilities whatsoever in our deck, this card is effectively a one-sided Stadium that can slow our opponent down from using key abilities like Suicune Vs Fleet Foot, Crobat Vs Dark Ascent, or Arceus VSTARs Starbirth ability
While Gardevoir doesn't usually boast over-the-top artwork that can warrant being called the best card in a set, its LV
Double Colorless Energy: Helps to load up Kyogre-Groudon faster