Taxing

Taxing is a slang term used to describe spells that stop an opponent from doing something unless they pay a price (usually extra mana).

Taxing is a white mechanic. Taxing cards are most often creatures and enchantments, but occasionally are done as one-shot spells.

Examples are Kataki, War's Wage, Thalia, Guardian of Thraben, and Archangel of Tithes.

See also: Ghostly Prison effects