What you need is a strategy.
I cannot stress this enough! There is very little pay to win elements in @splinterlands I have beaten Max Level teams with just a Level 3 Legendary or Level 5 Epic Summoners. If you know all the cogs in the machine, there is a good chance you will be able to be the David that beat Goliath.
!PIZZA
Sometimes luck is also needed to win the battle.
RNG is RNG. It cuts both ways......but only for Melee & Ranged damage. Thats why Magic based decks are so popular as you never miss unless its some abilities.