RWBY: Amity Arena is a real-time RTS that's not unlike Clash Royale. Starring characters from the North American Anime series, Rooster Teeth, it keeps to the 3D animation style of the TV show throughout the game.
Game systems will definitely ring a bell for anyone who's ever played Clash Royale. Your enemy's main tower is your target, and you'll need to make use of your troops -- which generate at random according to a range of preset characters available in your deck. Certain cards have a higher energy cost and other require a longer cool down period.
Join up in free field battles or in arena-style combat that gains you access to a full league of higher level players -- if you're good enough, that is. As you advance you'll face increasingly difficult battles that'll require you to adeptly fatten up your deck with the right balance of characters. Level up their abilities with the winnings you pick up via the winner's haul of hefty prize chests after each battle.
RWBY: Amity Arena is an almost canonical MOBA. Its main appeal is the charm of its graphics and the fact that you can interact with characters from Rooster Teeth like Ruby Weiss, Blake and the whole lot of inhabitants that live in the world of Remnant.