Repeatable Keyword Gains Count Toward As-Fan

Mark Rosewater defines as-fan as the average number of cards with a feature in a booster, adding together the contributions from different slots and rarities. In his Blogatog explanation of as-fan, eight cards with a mechanic among 80 commons give each common slot an as-fan of 0.1; across nine common slots, that contributes 0.9 cards per booster on average.

For a keyword such as flying, a card that can repeatedly gain it is “mostly thought of as having it,” Rosewater answered on Blogatog on November 4, 2026. One-shot spells usually do not count the same way. But a creature that repeatedly gives flying to another creature does not count as a flier: Rosewater made that distinction in a follow-up answer.