Tellin ya, man, Draco and Kreela are likely your best two. Though I could be convinced for using Fatman instead of Kreela.

idk about that .. he made fast tower crusher build a 1 key speedtune on void(when its a 3 , at best 2 key team. .. he does a ton of dmg , who would you replace him with ? Cuz i use the same fast towercrusher build poly uses ...only diff is he use draco and me anax .. and gearing , similar stats but not the same ...

https://deadwoodjedi.com/speed-tunes/fast-tower-skullcrusher-unkillable-copy/

Skullcrusher or bushi 

helicath 

fatman 

gnut

anax or fatman ..