巫術
派出一個衍生物,此衍生物為目標永久物之複製品。如果施放此咒語時支付過


,則改為派出一個為該永久物之複製品的衍生物,但該衍生物具有「當此永久物進戰場時,若它是生物,則它與至多一個目標不由你操控的生物互鬥。」
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.