Board Thread:Questions and Answers/@comment-2600:1700:8D10:AC80:D074:FE32:327A:98AA-20191009204127/@comment-36926291-20191121153439

If you're talking about BTDB(as that is one of the listed topics) then I would say that Ninja(t4 required) Farm, super, and random(though a Heli or wizard would be preferred as a random. If you're talking about BTD6, then well, farm like crazy in early game(ninja or engi start) then get Apache Prime or something like that.