This Cat Soldier is very similar in design to Regal Caracal from Amonkhet. That card was really powerful, and this one will see a lot of play as well. But the difference is that Leonin Warleader creates two tokens every time it attacks and not just once when it enters the battlefield.
This means that every turn you can potentially create two extra tokens and have quite a board at the end of the game. This just proves once again how strong the white color is in this set.