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Ogniqualvolta la Musa del Maelstrom attacca, la prossima magia istantaneo o stregoneria che lanci in questo turno costa

in meno per essere lanciata, dove X è pari alla forza della Musa del Maelstrom mentre l'abilità si risolve.
To determine the total cost of a spell, start with the mana cost or alternative cost you’re paying, add any cost increases, then apply any cost reductions (such as that of Maelstrom Muse’s triggered ability). The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
Maelstrom Muse’s cost reduction can reduce only generic mana in a spell’s total cost. It can’t reduce colored mana requirements.