Grumblemon #BT7-060 is a Digimon Next Adventure card for the Digimon card game, printed in the Unknown rarity slot of the set. Collectors view it as a low-value pick-up, with current market value around $0.08, reflecting limited demand and frequent availability. Grading or recent sale data can narrow prices further, but ungraded copies typically trade at small single-digit cents. The card is useful for set completion rather than investment.