Harsh Mentor

A taxer aimed at a part of the game most hatebears ignore: the activated ability. Where Thalia, Guardian of Thraben taxes casting and Spirit of the Labyrinth shuts off extra draws, this one stands on the battlefield and bites every opponent who fires off a fetchland crack, an equip cost, a creature's tap effect, or a man-land's activation. The trigger is scoped tightly to artifacts, creatures, and lands, and the mana-ability exemption is the pressure valve on the whole design: nobody gets punished for tapping a Sol Ring or a dual land for mana, which is most of what activated abilities actually do. What is left is the discretionary stuff, the engines and the toolbox creatures, and that is precisely the surface area this hits. The body is small, but it is a body: this tax walks, attacks, and trades, so it is rarely a dead draw the way pure hate pieces can be. The design tension is that it punishes a category players have been trained not to think of as a cost: cracking a fetch, animating a creature-land, sinking mana into an artifact engine. Each of those becomes a two-damage decision, and a board full of these turns an opponent's value engine into a clock running the wrong way.