Can't Attack

Can't Attack is an effect that prevents your creatures from attacking your opponent or their creatures.

Details
This ability is often treated as a Demerit.

Blockers
Light Civilization creatures with the Blocker keyword have "This creature can't attack players" while Water or Darkness creatures with  Blocker have "This creature can't attack".

There are also other creatures that are unable to attack creatures or players in the other civilizations.

Creatures with this demerit often have a greater cost-to-power ratio than normal creatures.
 * Cards such as Cutthroat Skyterror are often specialized in returning attacks due to this.

Prevent Attacks
Some cards restrict attacks by certain creatures.

Cards with these effects are useful as a defense measure. By locking your opponents attacks, it can also lead to the potential of Deck-out if not removed.
 * Nariel Enforcer is a famous decktype utilizing these 2 cards together, however Nariel, the Oracle is in the Hall of Fame.

The most commonly used cards in this category include:
 * Nariel, the Oracle
 * Noble Enforcer
 * Slowly Chain
 * Insight Indigo Kaiser
 * Ryusei the Forever Kaiser

There are also some creatures such as Fuuma Garmagias that prevent your other creatures from attacking.

Diamond State
Some cards have the ability to invalidate the "Can't attack" effect, this is known as Diamond State.

There are many in the Light Civilization, and are heavily used in decks based on blockers. It can also be used to invalidate the lock by cards such as Nariel, the Oracle. However the Diamond State cards have a range of effects on how they invalidate the "can attack" effect.


 * Invalidates "can't attack player" effect.
 * Diamond Sword
 * Diamond Glorius, Light Divine Dragon
 * Diamond Aven, Spirit of Awakening
 * Invalidates "can't attack" effect.
 * Colonel Koala, Forest Commander
 * Wiz, White Knight Enlightener
 * Great Chakra, the Storm Awakened (not summoning sickness)