神器生物 — 地侏
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固色~當發條僕從進戰場時,若施放它時支付過至少三點相同顏色的魔法力,則抽一張牌。
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.