生物~人鱼/法术师
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:目标生物得-X/-0直到回合结束,X为由你操控的人鱼和/或仙灵数量。
A permanent that’s both a Merfolk and a Faerie is counted only once when determining X.
The value of X is determined when Silvergill Douser’s ability resolves. It won’t change later, even if the number of Merfolk and/or Faeries you control changes.