Channel
Channel is an ability word indicating that a card may be discarded for an effect. It was introduced in Saviors of Kamigawa.
Channel is written "Channel -- {Cost}, Discard this card: {Effect}."
Channel was featured only on spirit creatures. Flavorwise, Channel represents spirits gathering all of their energy and using it for a one-time special effect. It has an interaction with Epic and Soulshift; Channel abilities are often similar to real spells, but you may play them after playing an Epic spell. Soulshift allows you to reuse Channeled cards.