黒の太陽の黄昏 {X}{B}

インスタント

クリーチャー最大１体を対象とする。ターン終了時まで、それは－Ｘ/－Ｘの修整を受ける。Ｘが５以上であるなら、あなたの墓地にありマナ総量がＸ以下であるクリーチャー・カード１枚をタップ状態で戦場に戻す。

「かつて停滞があったここにシェオルドレッドが野心をもたらし、ほどなくヨーグモスの意思が支配した。」
――碑文

Illustrated by Jonas De Ro

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Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
The creature card you return, if any, isn't a target of Black Sun's Twilight. You choose it as Black Sun's Twilight resolves if X is 5 or more. (2023-02-04)

You can cast Black Sun's Twilight without a target (presumably with X equal to 5 or more) just to return a creature card. However, if you do choose a target, and that target is illegal at the time the spell tries to resolve, the spell won't resolve and none of its effects will happen. You won't get to return a creature card to the battlefield. (2023-02-04)