Once he has finished casting his spells, the player whose turn it is can use Dispel cards in his hand against any enemy spells still in play (see below for a description of these spells).
Only a single attempt can be made to counter any one spell. Power cards may be used to boost the chance of the Dispel working in the normal way.
Unique counter magic cards (Mental Duel, Destroy Magic, and so on) cannot be used to dispel spells that are already in play. Only Dispel cards can be used. Other counters work directly on the mind of the enemy wizard as he is casting a spell, and once a spell is cast this kind of counter magic becomes ineffective.