Magister's Apprentice not working properly

I was playing an arena game as Shaman-Mage and had an Arcane bolt in hand, generated by the Wyrm, on turn 2 I played the Magister’s Apprentice, saying my Arcane spells shoud cost 1 less. However, my Arcane bolt was not costing 1 less. I have a screenshot of this but idk how to share it.

No, he means this card:

Common · Minion · March of the Lich King · Your Arcane spells cost (1) less.

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