Zombie Trailblazer

Swampwalk evasion is one of the oldest unblockable mechanics in the game, and almost every printing of it before this point relied on the opponent simply happening to play Swamps. This card removes the contingency: one of its abilities turns any target land into a Swamp for the turn, the other hands swampwalk to a creature, and chaining the two means a black tribal board can manufacture its own evasion on demand. The cost is paid in tapped Zombies rather than mana, so the deck that wants both effects in a turn is the deck that has already committed to flooding the battlefield with the creature type, which is exactly the constraint that keeps a repeatable "make-them-vulnerable, become-unblockable" engine from being free. The triple-black casting cost reinforces that: this is a card built to reward a board that is already mono-black and already wide, not a splash. What makes it more than a tribal curiosity is that it solves landwalk's structural flaw at the source. Instead of being a dead evasion keyword against the wrong opponent, swampwalk here becomes a tool the controller activates, the same way later sets would eventually let creatures generate the terrain they need to slip past blockers. It is a small, self-contained combo printed onto a 2/2, and the whole apparatus only comes online once the rest of the graveyard-and-Zombies shell is already on the table.