마법물체 생물 — 고양이
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, 당신의 손을 버린다, 다이아몬드 사자를 희생한다: 원하는 색의 마나 세 개를 추가한다. 순간마법 시기에만 활성화할 수 있다.
You can't cast an instant (or activate an ability as an instant) while casting a spell. Therefore, much like Lion's Eye Diamond, you can't activate the ability intending to use the mana to cast a spell from your hand.
Even though you can only activate this as an instant, it is still a mana ability. It doesn't use the stack and cannot be responded to.