Kaervek the Merciless [Archenemy]

Set: Archenemy Type: Legendary Creature — Human Shaman Rarity: Rare Cost: {5}{B}{R} Whenever an opponent casts a spell, Kaervek the Merciless deals damage equal to that spell's mana value to any target. "Rats and jackals feast in his swath, but even they will not walk with him." —Mangara