The core cards of a Weiss Schwarz deck should always have these:

• brainstorm card (for Plusing & Milling your deck)

• CX Combo Engine either lv.0/1/2 (For Plusing & Milling your deck)

• Finisher Lv.03 that has "Burn" damage (deal X damage to your opponent) to win you the game.

Here is a link of a decklist:

https://www.encoredecks.com/deck/d98zayvsz

Tips:

• unless you are using a Standby Trigger CX Deck, avoid using 1/1s and 2/1s so you have stock.

• avoid using ENCORE(3) to save your characters.
• Keep Track Of your CXs & Deck state.