They provide extra resources to help you play expensive spells early and are focused on utility
You could also go with the Nidoking Evolution lineup (Nidoran, Nidorano, Nidoking) if youre looking for a slow-build, high-damage Poisoned deck
You are ready to become a knight, I believe

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Ionos Bellibolt ex will need to evolve from Ionos Tadbulb
Energy types: Fire, Water, Lightning, Fighting, Psychic, Colorless, Darkness, Metal, Dragon and Fairy Size There are two size versions of holes for the cards