If only one Midnight is in play, wizards cannot cast spells without her permission. She also destroys all magical items held by the opposing champion.
Copyrights:
TSR
Wizards of the Coast
This card is a reprint of Midnight, Goddess of Magic (46/2nd) with the same text and the same special power. Midnight, Goddess of Magic (487/4th) has different text and special powers.
Wizards must ask Midnight's permission to cast spells, even cleric spells. Once a wizard receives Midnight's permission, that permission cannot be revoked until the start of the next player's turn. Wizards may ask permission before playing a spell card. Only Wizards need to ask permission. Other champions capable of casting wizard spells do not need Midnight's permission.
Midnight Copying Midnight's permission power actually copies the text as it is written. So, by copying her power Drawmij merely duplicates the command that wizards must ask the original Midnight for permission to cast spells. The copying is therefore redundant.