It's not a specific mechanic, but a great way to describe this play pattern, and is a much better slang term for describing the archetype than cards leaving the graveyard
This engine, however, along with the Dark/Rocket, Gym, and Magma/Aqua ones, are rather weak nowadays when compared to mixing and mashing the best of cards from all sets EX Legend Maker (this set has some nice Stadiums) EX Legend Maker Cursed Stone Stadium: Any time between turns, each player places on damage counter on any Pokmon with a Pok-Power
Thats because its unexpected Dark Tera typing sidesteps traditional counters, while its Burning Darkness attack scales with opposing Pokmon in the discard pile for some seriously lethal late game play
Hilariously, poor Gollum cant normally become the Ring-bearer this way, since hell be in your graveyard, but if youve got instant-speed ways to bring him back from the graveyard to the battlefield, then Gollum will be able to finally reclaim his Precious
You then lose two life