Spontanzauber
Bringe einen Zauberspruch oder eine bleibende Karte deiner Wahl, die kein Land ist, und den bzw. die ein Gegner kontrolliert, auf die Hand seines bzw. ihres Besitzers zurück. Du kannst einen Spontanzauber oder eine Hexerei mit gleichem oder niedrigerem Manabetrag aus deiner Hand wirken, ohne seine bzw. ihre Manakosten zu bezahlen.
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.