Duskmantle Guildmage

The first activated ability is the engine, and the second is the fuel pump: paying once turns any card hitting an opponent's graveyard into a point of life loss, and paying again refills the well by milling two. The wording on the first ability is deliberately broad. It does not say "milled," it says put into a graveyard from anywhere, so every fetched land that cracks, every dead creature, every discarded card, every spell that resolves and goes to the bin all count, and each one drains a life while the trigger is online. That breadth is what turned a mill strategy from a slow library-depletion clock into an alternate damage source: instead of racing to empty a sixty-card deck, you tax the opponent's every interaction with their own graveyard. The cost structure is the brake. Both abilities want mana, and a build that intends to win through the drain has to leave enough open to pay the first ability before anything dies, then keep finding ways to send cards to the yard while the meter runs. Mill cards that were previously prized for the size of the number became prized for the velocity instead, because every two cards is now two life, not just two fewer in the library. As a 2/2 body it offers nothing on defense; the value is entirely in the loop it builds, and the loop only matters in a deck constructed to feed it.