The Gwent card featuring Gaunter O'Dimm's Mirror is a dark fantasy artifact with a highly detailed, ornate frame resembling twisted, organic tendrils that seem to move when viewed from different angles. The mirror's surface is a polished, obsidian-like material that reflects light in an unnatural, shimmering manner, suggesting otherworldly properties. Intricate runes and symbols are etched along the frame, glowing faintly with a sinister blue hue, emphasizing its mystical and cursed nature.