You want to make sure you are able to cast them from your hand as you build your land progressively, and you want to have a good chance of consistently pull the right spells
"creature" spells summon creatures that can attack and damage an opponent as well as used to defend from the opponent's creature attacks
Adding cards that draw, recur, copy, or boost your board when you play enchantments helps make every turn more impactful
[D][C] Poison Chain (10 damage) Your opponent's Active Pokmon is now Poisoned
Additionally, ex cards, like Pikachu ex, Mewtwo ex, Charizard ex/Moltres ex, Starmie ex/Articuno ex, Venasaur ex, and Marowak ex, are the lynchpin for many of the most powerful decks in the game
I started with an Angel of Serenity in my deck