Junk Diver

Recursion that pays for itself when the body dies, which is exactly the body you want to throw away. The trigger fires only on death, so blocking, chumping, sacrificing, or trading in combat all return a better artifact than the Bird itself, while bouncing or exiling it gives you nothing. That distinction is what makes it engine glue rather than a value creature: the chain cares about feeding the graveyard, not just clearing the battlefield. The 1/1 flying frame is almost incidental beyond getting it down cheaply for colorless mana. The one restriction doing all the load-bearing work is the word "another"; the trigger reads "another target artifact card," so it cannot rebuy itself, which is the line between a recursion piece and a free one-creature loop. Pair it with a second artifact in the yard and a repeatable way to bring the Bird back, and it becomes the connective tissue of a sacrifice chain, asking nothing of your turn while guaranteeing the artifacts you feed to outlets keep coming home. This sits in an early-era tradition of designs that convert artifact death into card advantage, and it has stayed relevant for decades precisely because its job is so narrow and so reliable. Myr Retriever later refined the same "dies, returns an artifact" idea onto a cheaper colorless body, but the lineage gets off the ground here, carried out of the air.