battle styles pokemon booster pack Sword & Shield - SWSH05 or unearths a series of lightning Battle Styles Booster Box Opening!

When you obtain a card included in multiple booster packs, it will be registered in the card dex for all corresponding booster packs. This change will also apply to cards you already own

The thing is it doesn't really do that much to help your synergy

You can include up to two copies of a card in each deck

These cards can include any type of Trainer card, such as a Pokmon Tool

Wildfire + Burning of Xinye Wildfire and Burning of Xinye are cards you can build a deck around, especially in formats like Cube

The other resource, and this one is particularly good for finding unloved or underappreciated cards, is Scryfall, specifically the advanced search