我こそがダスクモーン

持続計略

（持続計略は破棄されるまで表向きのままである。）

あなたの終了ステップの開始時に、あなたの手札から呪文１つを、マナ・コストを支払うことなく唱えてもよい。そうしたなら、この計略を破棄する。

「我は無限だ。貴様が目にするすべては、たとえ上空の星でさえも、我が領域なのだ。」

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Duskmourn: House of Horror Commander #334

Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
You choose whether to cast the spell as I Am Duskmourn's ability resolves. If you do, you do so as part of the resolution of the ability. Timing restrictions based on the card's types are ignored. (2024-09-20)
If you cast a spell for another cost "rather than pay its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the spell has any mandatory additional costs, such as that of Abhorrent Oculus, those must be paid to cast the spell. (2024-09-20)

If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost. (2024-09-20)