the combo can be slightly different.
1st row : Mage Int/Dragon
2nd row : Arch Int/Bear
3rd row : Arch Dex or Mage Dex/Bear
4th row: Double Knight Int
5th row : Double Bear
6th row : Arch Int/Mage Int
7th row: Mage Dex or Arch Dex/Knight Int
8th row onwards u can choose depending on the situation. If you leak MSPD monster try to counter them with Knight Int and Knight Str, if its High HP monsters you can try AOE Damage towers
NB: Spend all Bd straight up in the first place