Edit: And I see now that fully half of my card selections don't actually recur anything from YOUR graveyard, just opponents
[13] Mountains (Winged Beast, Dragon, and Birdfolk Types
Obviously, buying yourself a little time is useful, but another possible part of the equation is that, unlike most of these two-cost cantrip artifacts, this one can sacrifice itself every turn
Vengevine and friends were explosive, but ultimately too inconsistent to have staying power
Ezuri, Claw of Progress While it doesnt have to be elves, Ezuri, Claw of Progress wants you to play small creatures and generate experience counters
These initial elementals from Lorwyn and Morningtide mostly played it safe when choosing the ETB effects, probably understanding that the mechanic on its own already added power and complexity