Klothys is mostly destined to find a place in Commander format. However, there are some promising lists popping up in other formats as well.
For example, it can take off in Modern Jund and Gruul lists in Pioneer and Standard. This means that Klothys will mostly end up in midrange and aggro lists that look for cheap ways to get a lot of damage out really fast.
If it were a mono-red creature, then this would have a much better pricing situation. Since it needs to be paired with green color, then it makes the card less attractive. Still, the current price is good enough.