I used to win fairly in this game weeks ago using NFT heroes, like at least 8 wins, 8 lose for 20 energies. Now, I need to at least 30 games to have 5 wins to finish the quest. My mmr now is 500+. And shockingly, there were players in this mmr that could kill the monsters without getting far away from the entrance. They could even kill mvps. Damn tough game.