4 Professor Oak Pot Of Greed When your deck already consists of only 20 cards, the ability to draw two is beyond valuable
There are currently 11 types of Energy cards, which correspond to the same number of Pokemon types available in the game: Fire Grass Water Dark Psychic Fighting Metal Dragon Fairy Lightning Colorless Of all the energy types, Colorless Energy (which represents Normal-type Pokemon) is the most commonly used one, and it can be replaced by any energy type when performing attacks
How are you upgrading yours
You can use the oozes tokens or Hanweir Garrisons tokens as sacrifice fodder, you can double their attack triggers with Isshin, Two Heavens as One theres just lots of places you can slot these cards into in the hopes of melding them into one massive threat
Setons ability doesn't require them to have haste either, so you can easily dump out your hand by turn 4
If you roll chaos you get a 1/1 deathtouching, hasty assassin