MotifDeck is an AI game art workspace focused on the creation and refinement of game characters and motion. The platform, guided by an AI named Moti, allows users to animate a character first and then select between 8 and 64 usable frames from the generated animation. It supports the creation of matching props and scenes across six distinct art styles, including pixel art and cartoon. The workspace organizes characters, props, and scenes within a single project. The workflow begins with an idea or a reference image, allowing users to upload a character, choose a movement, and generate an animation. The process involves setting poses and rhythm, aligning the character, and previewing the result. Users can recolor individual frames, compare animations in sync, inspect motion issues, and regenerate specific parts. Additional capabilities cover character expressions, world building, effects and shadows, and scene motion. MotifDeck provides starting points for various game art needs. These include crisp silhouettes for side-scrolling worlds, expressive heroes for arena action, clean lines for airy worlds, ink and brushwork for isometric battlefields, and simple shapes for a strong visual rhythm. The platform also offers themed collections, such as the Halloween collection, which provides starting ideas for characters, props, and environments.