How to Build Your First Beyblade X Deck
Deck battles use three beys, and the point is coverage rather than three copies of your favourite. A deck of three attackers loses to anything that survives the first exchange.
Cover the three roles
Build one attack combo, one defence combo and one stamina combo. That way whatever your opponent brings, you have something that matches up reasonably. You do not need three separate purchases to do this if you buy parts that recombine.
Buy parts, not beys
Two starters and one booster give you six parts and enough combinations to fill a deck properly. Buying three complete beys and never swapping parts is the most common and most expensive beginner mistake.
Leave room to change
Your first deck should be a starting point. Keep testing combos between battles and swapping parts rather than treating the deck as fixed, because the matchups you actually face locally will tell you what to adjust.