Gravel Slinger

Defensive pingers like this solve a problem pure walls and pure deathtouch cannot: they tax the act of attacking without committing to a block. The tap ability only reaches creatures that have already entered combat, so it sits idle when no swords are out and becomes a repeatable toll the instant the opponent declares attackers, shaving a point off an X/1 aggressor or finishing what a blocker began. The morph wrapper is where the timing turns predatory. An attacker swings into what reads as a vanilla 2/2; you flip it for during declare-blockers, and now a 1/3 can ping one of those attackers before combat damage resolves, unwinding the math the opponent had already committed to. The 1/3 frame completes the picture: three toughness lets it eat a swing and tap again next turn, while one power keeps it a patient gatekeeper rather than a clock that ends games. This is attrition built to make racing miserable, a point of damage at a time, turn after turn, until the aggressor decides the toll is not worth paying.