記憶の洪水
ソーサリー
墓地からインスタントかソーサリーであるカード１枚を対象とする。それを追放する。そのカードを３回コピーする。あなたはそれらのコピーを、そのマナ・コストを支払うことなく唱えてもよい。記憶の洪水を追放する。
Illustrated by
Commander Legends#638MythicJapaneseLegality
Rulings
You create and cast the copies all during the resolution of Mnemonic Deluge. You can’t wait and cast them later. If you don’t cast all three copies, the ones you don’t cast will cease to exist.
Because you’re casting the spells during the resolution of Mnemonic Deluge, ignore any timing restrictions based on card type. In other words, you can cast copies of a sorcery card this way.
If you cast a spell “without paying its mana cost,” you can’t choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, you must pay those to cast it.
If the card you copy has 
in its mana cost, you must choose 0 as the value of X when casting the copy without paying its mana cost.