Adiris, Priestess of Plagues

Whenever an opponent activates an ability of
an artifact, creature, or land on the battlefield, if it isn't a mana ability,
Harsh Mentor deals 2 damage to that player.
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"It shall be known across the land that the Gods curse the unfaithful. And terror shall take hold
of a defiant non-believer, who shall falsely announce my arrival." — Adiris