Wall of Corpses

A wall that doesn't just hold the line: it executes whatever runs into it. The body blocks like any defender, but the second clause turns that block into a guaranteed kill, trading the wall itself plus a black mana to destroy the attacker it stopped. The targeting clause keeps the rate honest: destruction only fires on a creature this wall is currently blocking, so it cannot be pointed wherever you like. You have to commit to the block first, eat the assignment, then cash in. That sequencing means the trade happens inside the combat step, after attackers are declared and blocks are locked, which lets it answer a creature that would otherwise punch through or survive ordinary damage. It is, in effect, a deathtouch blocker rebuilt out of an activated sacrifice rather than a keyword: same outcome (one attacker dies for one wall), different machinery, with the black mana acting as the cost that stops the trade from running away. The Wall typing also means it sits behind your line as a deterrent before it ever blocks, since an opponent has to weigh whether the swing is worth feeding the sacrifice. A modest piece, but a clean early example of defensive creatures asked to do more than soak damage.