Slavering Nulls

The discard rider is the whole point of building around this Goblin Zombie, and the conditional that gates it tells you exactly what kind of deck wanted it: a two-color aggressive shell that runs Swamps on purpose, not as a splash. A 2/1 for two that hits for one card per connection is a beating in the early turns, when the opponent has a full grip and nothing to spare; the discard arrives with the damage, so it punishes the same tempo gap the body is already exploiting. The design's restraint is the Swamp clause, not the trigger itself. Plenty of cards make a player discard on combat damage; pinning it to a black source keeps the effect off mono-red boards, where a hasty one-card-per-turn drip would be too clean a clock to combine with reach. As a Rakdos build-around it sits in a familiar lineage of evasion-or-aggression-plus-disruption creatures, the kind that turn a chip-damage attack into a resource war you are winning on both axes. The catch is the body: 2/1 dies to everything, blocks nothing, and stops connecting the moment the ground stalls, so the discard is front-loaded value that decays fast. It is a creature that wants to be unblocked on turn three, not gummed up on turn six, and the deck that ran it had to be built to keep the lane open.