Moreover, something similar (if not outright copied) already existed in the third Warcraft game in its expansion pack.
"Inventing" a race with seven units is a matter of a single day for some. I put "inventing" in quotes because nothing new was actually invented – taking a Naga and redrawing it in the style of medieval Japan doesn't require much intelligence.
Is it easy to come up with and draw? Go ahead. Demonstrate it, since it's so simple. That's two.