法术
派出一个衍生物,此衍生物为目标永久物之复制品。如果施放此咒语时支付过


,则改为派出一个为该永久物之复制品的衍生物,但该衍生物具有「当此永久物进战场时,若它是生物,则它与至多一个目标不由你操控的生物互斗。」
If an effect allows you to cast a spell without paying its mana cost, you can't choose to cast it and pay unless another rule or effect allows you to cast that spell for a cost. Similarly, you can't waive a cost reduction unless that effect says you may.