Design a whimsical birthday card illustration with the central theme being a lighthearted rugby match happening on a vibrant, green field. The players should be wearing colored uniforms in gold, blue, and red. The sky above should be sparkling with stars, featuring a vague cloud formation suggestively resembling a spaceship. A festive 'Happy Birthday' banner, penned in a futuristic font, should be stretching above this playful scene. The overall ambiance should reflect the thrill and excitement characteristic of a sport event blended with the intrigue of science fiction.

Generated with these themes: Rugby, and Star trek.

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