Leyline Channeler

Heroic — Whenever you cast a spell that targets Leyline Channeler, you may discard a card. If
you do, untap Leyline Channeler.
{t}: Add one mana of any color. Spend this mana
only to cast an instant or sorcery spell.
I tried to discover, in the rumor of waves, words that
others could not hear, and I pricked up my ears to
listen to the revelation of their harmony.
— Gustave Flaubert