A disruptive discard spell from Magic: The Gathering, Thoughtseize appears as a promo in the Double Masters set and is listed with an Unknown rarity. Collectors view this printing as a supplemental promotional release rather than a standard set core card, which can affect demand compared with regular set copies. The current market value is $0.00, reflecting either lack of recent sales or unpriced listings in aggregation sources. Condition and provenance typically determine any collector premium