So here's a (untested, just hypothysising here) raid strat:

Tame giga: any lvl works

Hop on giga WITH NOTHING THATS IMPORTANT

Bring giga into enemy base

Fight to rage or death, rage preferably

Once rage let it, well, RAGE, don't send anything in

I it dies, either send more throw aways, or rinse and repeat

If it doesn't, you win!