You can equip this card to a monster that is unaffected by Spell Cards, such as "Horus the Black Flame Dragon LV6", activate it to see a card from your opponent and still be able to attack with the equipped monster.
Equip this to a monster that cannot be destroyed by battle.
This card can be used to alleviate the drawbacks of monsters that must attack if able, such as "Berserk Gorilla" or some of the "Karakuri" monsters
Equip this card to a monster that can no longer attack after using its effect like "Chaos Sorcerer".
Equip this to a monster used for high defense as opposed to its attack, such as "Mystical Elf".