冥途灯りの行進 {X}{W}

インスタント

この呪文を唱えるための追加コストとして、あなたはあなたの手札にある望む枚数の白のカードを追放してもよい。この呪文を唱えるためのコストは、これにより追放されたカード１枚につき{2}少なくなる。

アーティファクトやクリーチャーやエンチャントのうちマナ総量がＸ以下である１つを対象とする。それを追放する。

Illustrated by Gozz

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Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
You may exile more cards than necessary for March of Otherworldly Light's first ability, but you can't reduce the mana it costs to less than {W} this way. (2022-02-18)
For example, say you wanted to choose a target with mana value 6. You need X to be at least 6. You could choose to cast March of Otherworldly Light by paying {6}{W}. You could also exile white cards from your hand to reduce that cost by {2} for each one. If you had a reason to, you could even choose a greater value for X. (2022-02-18)

The mana value of March of Otherworldly Light while it's on the stack is the value chosen for X plus 1, no matter how much mana you actually paid to cast it. (2022-02-18)