瞬间
至多一个目标生物得-1/-1直到回合结束。你派出一个1/1黑色老鼠衍生生物,且具有「此生物不能进行阻挡。」
You can cast Rat Out without a target just to create a Rat token. However, if you do choose a target, and that target is illegal at the time Rat Out tries to resolve, the spell won't resolve and none of its effects will happen. You won't create a Rat token.