法术
将至多一张目标生物牌从你的坟墓场移回你手上。派出一个1/1红色佣兵衍生生物,且具有「

:目标由你操控的生物得+1/+0直到回合结束。只能于法术时机起动。」
You don't have to choose a target for Mourner's Surprise. However, if you do, and that creature card is an illegal target at the time Mourner's Surprise tries to resolve, it won't resolve and none of its effects will happen. You won't create a Mercenary token.