瞬间
反击目标咒语。 与一位对手比点。 若你赢,则在你下一个行动阶段开始时,你可以加

到你的法术力池中,X为该咒语的总法术力费用。 (参与比点的牌手各展示其牌库顶牌,然后将该牌置于牌库顶部或底部。 所展示的牌之总法术力费用比较高的牌手赢得比点。)
You decide whether or not to add that much
as the delayed triggered ability resolves at the beginning of your next main phase. You don't decide before then.