Deathslinger, Gun of Glenvale

Whenever an opponent casts a spell, Deathslinger, Gun of Glenvale deals damage equal
to that spell's mana value to any target.
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Upon catching prey unaware, the Deathslinger uses
his Redeemer to skewer fleeing victims with a long-distance harpoon. Accurate aim, patient
tracking, and sharp predictions are crucial to landing successful shots, but the reward of their scream as they’re reeled in will never sound so sweet.