The major release standouts of this period were the Burning Shadows Charizard GX (2017), and Tag Team card Reshiram & Charizard GX from the Unbroken Bonds set (2019), two very playable cards that quickly found their way into the meta game
They dont give us odds for this, but it covers every rarity
Anytime you want to activate an ability, it costs X less mana to do so, with X equaling Agatha's power
I don't know if will help, but Romhacking (their wiki more specifically) has notes and such for tcg2 that is already documented which could help
When used alongside a card that lets you reshuffle your graveyard back into your deck, Time Walk can still be quite the strong card, and that means its a highly sought-after one, too
First up is Marina Vendrells Grimoire , a blue-mana-powered artifact with some interesting new mechanics