インスタント
呪文や、土地でないパーマネントのうち、対戦相手がコントロールしている1つを対象とする。それをオーナーの手札に戻す。あなたは、あなたの手札からマナ総量がそれ以下でありインスタントやソーサリーである呪文1つを、マナ・コストを支払うことなく唱えてもよい。
If a permanent with
in its mana cost is returned to a player's hand this way,
is 0 for the purpose of evaluating its mana value.
If a spell with
in its mana cost is returned to a player's hand this way,
is the value chosen as the spell was cast for the purpose of evaluating the spell's mana value.
If the spell you cast has
in its mana cost, you must choose 0 as the value of X.
If a spell is returned to its owner's hand, it's removed from the stack and thus will not resolve. The spell isn't countered; it just no longer exists. This works against a spell that can't be countered.
If you cast a spell "without paying its mana cost," you can't pay any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.