Fairy Tail Series 2 Episode 38: Erza vs. Sagittarius! Horseback Showdown!
Episode 38 of 102 of Fairy Tail Series 2, aired December 19, 2014, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Erza faces off against Sagittarius in three equine-related events. Gemi and Mini turn Gajeel and Tiger Lily into small furry pets. And Ophiuchus reveals her true form to Natsu and his team!