I have carlsbro Keyboard Amp. It's really big and powerful....thats all i know about it! Would I be able to use it to amplify the sound of a microcube?

Yeah, I do it all the time, just put a cable from the rec/line out to the keyboard amp's line in if you didn't know that already.
Epiphone Les Paul Standard
Washburn Acoustic
Jay Turser Bass
Panasonic SX-KC211 Keyboard
BOSS DS-2 Turbo Distortion
BOSS AW-3 Dynamic Wah (Fixed!)
Roland Micro-Cube
Randall RB30XM Bass Amp
Tascam DP-01FX Digital Recorder