Mayhem

MTG Mechanic

Mayhem is a new ability that allows you to cast a card from your graveyard for an alternative cost if you discarded it that turn. If you cast it this way, you pay the mayhem cost rather than the mana cost. As the reminder text reminds us, mayhem doesn't change when you can cast a spell, so if you discard Electro's Bolt on an opponent's turn, you can't take advantage of mayhem because Electro's Bolt is a sorcery.