Gnathosaur

A six-mana 5/4 that wants to be played in a deck full of artifacts it can afford to throw away, which is a narrower brief than the body suggests. The trample-granting ability is the entire pitch: feed it spent equipment, used-up clue-style tokens, or dead artifact lands and it punches through chump blockers. The friction is that it asks you to spend a resource to make combat math work on a creature that already costs six, in a color that historically struggles to generate disposable artifacts on its own. That puts it squarely in the lineage of artifact-sacrifice payoffs from the metal-themed sets, where the assumption is that you are already producing fodder for other reasons (a Krark-Clan Ironworks shell, an affinity board, an aristocrats engine that happens to lean on artifacts) and Gnathosaur is just one more outlet that turns surplus into damage. On its own it is a beater with a parasitic activation; the Dinosaur type was retconned on later, but the design predates any meaningful Dinosaur support and never benefited from it. The honest read is a role-player for decks built around artifact attrition, not a reason to build one.