So the rule is 4G with a combination of 2 combos with balance type bits and 2 combos with defense type bits. 
Bladers do a rock paper scissors to pick side and the winner of the rock paper scissors get to build a 3G deck from that 4 combos first. 
If they choose to build a combination of 2 balance + 1 defense, their opponent can only use 2 defense + 1 balance, and vice versa.

I'm thinking of:
Phoenix Wing 3-60 Point
Wizard Rod 5-60 Hexa/Cobalt Dragoon 4-55 Elevate
Knight Mail 9-60 Wedge
1 other combo that I haven't figured out is the one that use Under Needle.

Under the assumption that my opponents would also use Wizard Rod 5-60 Hexa, what are the possible good combos?

Cobalt 1-60 elevate is good for Rod matchup, Pegasus or Phoenix on 3-60 Level for bursting or out spinning Dragoon I would bring Ghost Circle 9-60 Bound Spike as the third bey because it completely wrecks attackers and putting it in that third slot is likely to roll you an attack type opponent often. I say attack type, realistically that would be balance made to attack here. For 2nd defense slot, go with Silver Wolf M-80 Metal Needle or Gear Needle (let me cook)

Sorry those defense options are pretty expensive

Cobalt 1-60 elevate is good for Rod matchup, Pegasus or Phoenix on 3-60 Level for bursting or out spinning Dragoon I would bring Ghost Circle 9-60 Bound Spike as the third bey because it completely wrecks attackers and putting it in that third slot is likely to roll you an attack type opponent  often. I say attack type, realistically that would be balance made to attack here. For 2nd defense slot, go with Silver Wolf M-85 Metal Needle or Gear Needle (let me cook)

Sorry those defense options are pretty expensive

🤓 Aktually under needle would work better and metal needle is probably banned because it scratches stadiums

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We finally got CX
I like Perseus Dark S 760 disc ball
Trust me its good
I still hate wiz rod

Under Needle, and the rest of the needle family has nearly no defense. Metal Needle is banned tho. If you want "defense" Hexa is your best bet and even then its not exactly amazing for KO defense.