Maybe you were given a Pokmon card as a child for visiting the first Pokmon cartoon in the cinema
This guide covers current pull rates from Japanese community opening data, the top 10 most valuable cards with prices from both markets, a full box value breakdown, and a clear comparison of JPN vs EN pricing
In a deck that cares about having a big graveyard, this means that you're probably already on the back foot
After that I like Lyzolda, the Blood Witch or Gisela, Blade of Goldnight
I used to put The Immortal Sun in the majority of my EDH decks, as well, as it is such an overall useful card, but I eventually removed it from those decks, because it is expesnvie and takes too long to provide any significant benefits