ソーサリー
あなたの墓地にあるすべてのカードの中に5種類以上のマナ総量があるかぎり、この呪文は瞬速を持つ。
あなたの墓地にあるクリーチャー・カード1枚を対象とする。それを戦場に戻す。
The game checks whether it is legal to cast a spell before costs are determined or mana abilities are activated while casting it. If cards are removed from your graveyard after that point, such as by exiling Jack-o'-Lantern from your graveyard to pay for its mana ability, this won't affect whether you can legally cast Graveyard Shift, even if that reduces the number of mana values in your graveyard to below five.