The next battle, he definitely wouldn't deploy Circle God.
Lu Ran also knew that the strong opponents were later on, so he always tried to conserve his and his Pet Beast's energy as much as possible.
And the best way to conserve energy was to deploy a Pet Beast that countered the opponent's attributes; this way, he could end the fight relatively easily.
In fact, every time the countdown hit zero, Lu Ran always waited for the opponent to deploy their Pet Beast before deploying his own. Though this made his battle rhythm a step slower and potentially put him in danger, the critical point was... Lu Ran himself was not weak, so he wasn't afraid.
To deal with a Plantmaster like Yu Chuanqi, he used Flame; to deal with a Dragon Tamer like Dragon Ride, he used Circle God, which contained the top-tier Dragon God Bloodline to suppress.