巫術
抽三張牌。
固色~如果施放此咒語時支付過至少三點藍色魔法力,則占卜3。
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.