In addition to these abilities, there are also hidden abilities which are important in the game such as the hidden card find, and extra slots in the slot machine, however these abilities are not listed and have no effect on duels themselves. Stronger monster types such as dragons gain the ability to reduce the summoning cost of their own high powered, high levelled monsters, whereas weaker decks such as the low powered fairy deck relies on a much stronger set of abilities that harm enemy creatures whilst buffing and protecting their own. Leader abilities change depending on the type of monster cards, and are often used to compliment the type of monster. There are a total of 12 ranks for deck leaders - as they rank up, they gain leader abilities. If you have ranked up a card that can not be obtained, it will retain its abilities, but can not be used as the deck leader.

This also means it is possible to be hit directly even if you have monster cards out on the field.Дeck Leaders can be any monster card you have obtained, that has been levelled at least once with the ranking system. Also, just like the Deck Leader representing you playing the cards, it also represents you when you take a direct hit - any hit on the deck leader will LP damage to you as if it was a direct hit. Each turn you are also allowed to play one card within a surrounding tile of your deck leader - provided there is no enemy units occupying the tile. However, unlike monsters, your deck leader can never order an attack. Like Monster cards, Deck Leaders are allowed one move each turn - allowing it to move one space (or two, if it has the Increased Movement bonus). Your deck leader is essentially the 'avatar' of your deck - as it represents you playing the cards on the field.

Any deck you build needs to be assigned a Deck Leader. The main focus of the Perfect Rule is the deck leader system. In the intro, Simon McMooran states that the dueling rules differ from the ones that are in the present time and that they are under the 'Perfect Rule.'

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