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計略

あなたがこの計略を実行中にしたとき、各対戦相手はそれぞれ、自分のライブラリーの一番上にあるカード１枚を追放する。あなたはこれにより追放されているカードの中から望む数の呪文を、マナ・コストを支払うことなく唱えてもよい。

「無益な試みに嫌気が差さないのか？我なら諦めるところだが。」

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Duskmourn: House of Horror Commander #358

Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs, such as emerge costs. You can, however, pay additional costs. If the card has any mandatory additional costs, such as that of Tormenting Voice, you must pay those to cast the card. (2017-06-13)
If the card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost. (2017-06-13)
You must cast any of the exiled cards you wish to cast for free while this scheme's ability is resolving. You can't wait until later in the turn. Any cards not cast this way remain exiled for the rest of the game. The spells will be added to the stack in the order that you cast them. (2017-06-13)

If the owner of one of the exiled cards leaves the game, that card leaves the game as well. (2017-06-13)
Now you have learned. (2017-06-13)