Unique Custom Card Game Development

I need a talented game developer to create a custom card game with unique rules for mobile platforms (iOS/Android). The game should include both multiplayer and single-player modes, as well as in-app purchase options.

Key requirements:
- Innovative card game mechanics
- Engaging multiplayer and single-player modes
- Integrated in-app purchase system
- Mobile-friendly UI/UX design

Ideal skills and experience:
- Experience in game development, particularly for mobile platforms
- Strong understanding of card game dynamics
- Proficiency in implementing in-app purchase systems
- UI/UX design expertise for mobile applications

Please provide a portfolio showcasing relevant work.