Helldozer

Most land destruction comes as a one-shot spell you cast and discard; this welds the effect to a 6/5 body that keeps doing it every turn you can pay. Three black mana per activation is steep enough that the Zombie Giant was never going to be a Stone Rain on legs, but the targeting clause is where the design tilts: hit a nonbasic and the creature untaps, ready to go again the same turn if you can afford it. That asymmetry is the whole idea. Against a manabase leaning on dual lands, fetch targets, and utility lands, the activation has no tap-cost ceiling, methodically stripping one nonbasic per three black mana while basics get to sit there untouched (and cost a tap apiece to remove). The more sophisticated the opposing mana, the harder it is to play through, and the basics-only player barely notices. As a 6/5 it also threatens to close the game on its own once the opponent has been ground into mana-screwed inaction, which is the rare land-destruction payoff that does not demand you win in the same motion you set up the lock. It is a heavy triple-black commitment built for the long game, rewarding a deck that floods the board with black mana and converts the surplus into a slow strangle rather than a single explosive turn.