Dead Card

Rot refers to the cards in your hand or battle zone that are in state of no use at all under certain situations.

Details
Examples include:
 * No cards in your opponents hand, while you hold Lost Soul
 * Holding a high cost card during the early turns of the game.
 * Holding an Evolution Creature in your hand without an Evolution Source.
 * Each of your opponents creatures have too much power for a Category:Power Based Removal card.
 * A card such as Berlin, Bell Gravekeeper when your opponent doesn't use Card Discard.

Depending on the situation, even powerful metagame cards can become useless based on the deck you are playing against. Some cards such as draw spells will often always prove useful, but even powerful abilities such as Mana Acceleration can be useless with too much of it.