Winning at Splinterlands with low mana is more difficult than with high mana.
A good option is use as tank a monster with a good amount of health along with the healing ability.
In this battle I could still put a monster with the sneak ability to complete the daily quest and the chicken on the background.
https://splinterlands.com?p=battle&id=48044bf4e1838915659866992d9524104cfaf1d8&ref=rctjbt