Ch'lendu, Raging Flame

When an opponent casts an instant or sorcery, you may pay {r}{r}{p/r}{p/r}. If you do, deal damage equal to Ch'lendu, Eternal Flame's power to target creature or player.
"A mortal dares to resist my demands? How pitiful. I was beginning to think you brave, but now I see that is merely foolishness."