Source: Warhammer Fantasy: 4th Edition

The Loss of Wizards
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If one side has no wizards then it is still dealt magic cards as normal. Dispel cards can be used to attempt to cancel out enemy magic, but power cards and the special cards Total power, Mental Duel, Drain Magic, Destroy Spell, Rebound and Escape cannot be used at all and must be discarded at the end of the magic phase. This means that a side with no wizards may still be able to cancel out some enemy magic. This represents natural magical resilience and the likelihood of spells simply not working. A side with no wizards is not therefore completely helpless, although it is not in a very desirable position by any means.