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絆魂
エーテル追跡 ― あなたがクリーチャーでない呪文1つを唱えるたび、あなたの墓地にありマナ総量がその呪文と等しいクリーチャー・カード1枚を対象とする。それをあなたの手札に戻してもよい。これは毎ターン1回しか行えない。
If a card in your graveyard has
in its mana cost, X is 0 for the purpose of determining its mana value.
Krile Baldesion's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.
For spells on the stack with
in their mana costs, use the value chosen for X to determine the spell's mana value.