{:4_128:} 这条规则的表述是这样的
1.在某个效果加入堆叠前，必须有合法的目标和支付足够费用
2.如果在结算的时候，合法的目标消失了，那这个效果还将结算
英文FAQ如下（请熟读FAQ英文版）
第8页
Triggering a Card Effect (v1.1) 触发卡牌效果
In order to successfully trigger a card effect, the player must declare that he is activating the card, declare targets, then pay any additional costs denoted on the card. If a player cannot fulfill any requirements to trigger a card effect, he cannot attempt to trigger it.
要使用某卡牌效果，需要宣告目标，支付所有需要的费用，如果有任意需要条件不满足，玩家不能试图触发它
第10页
Illegal Target
If a card effect specifies targets, it checks whether the targets are legal when it is played and again when it
resolves. A target can become illegal if it is removed from play, if it is removed from the zone specified in the ability,
or if any specific characteristics on the card that were targeted have changed. If all of the targets for a card effect
become illegal, then the card effect is cancelled. If any of the targets are still legal when the card effect resolves, then
the card effect will resolve normally, only affecting the legal targets.
如果卡牌效果需要指定目标，它在打出时和结算时都将结算目标是否合法。
目标离场可以使目标变得不合法，如果目标被某个能力移动出某区，或者如果一个卡牌目标中所特别提到的家伙被改变了。如果所有的卡牌效果目标都变得非法，那该卡牌效果被消除。如果当卡牌效果结算的时候，有任何一个目标还合法，那卡牌效果还会正常结算，只会影响合法目标。
就当前的这个例子
1.在打出这张卡的时候，必须有2个合法的目标，只有1个目标，这个卡不能打出来
2.如果已经打出这个卡，还没结算前，被移除了其中1个目标，另1个还存在，那在这个卡结算的时候，该如何的那个还是如何，另外个不在场了就无视了。
