The basic chance of a Dispel working is 4+ against a wizard of equal level, 5+ against a higher level wizard and 3+ against a lower level wizard as explained on the cards.

Boosting Dispels

When a wizard attempts a Dispel the player may improve his chance of success by using one or more power cards to boost the counter magic dice roll. Each power card used in this way adds +1 to the dice roll. However, a roll of 1 is always considered a failure regardless of the number of power cards used to boost the Dispel.

Reinforcing Spells

A wizard may decide to reinforce his spell once the enemy has declared his counter attempt. Each extra power card added to the spell will reduce the Dispel roll by -1. However, a roll of 6 will always dispel, regardless of the amount of power used to reinforce a spell.

Unique Counter Cards

Counter cards that work like a normal Dispel can be boosted in exactly the same way as a Dispel card, for example Rebound, Destroy Spell etc.

Total Power/Drain Magic

A spell which is cast with the Total Power card cannot be countered, and a Magic Drain will always counter a spell unless it has been cast with Total Power or with the aid of a magic item which is the equivalent. Power cannot be used to either boost counter magic or reinforce spells in these cases.