It gives you card advantage, and it replaces any Zombies you control that might die perhaps due to sacrificing them to Wilhelts other ability
It offers excellent insurance against sweepers, which is nice, but the real value is in reusing Polukranos, World Eater, and to a lesser extent (oddly), Genesis Hydra or Nyleas Disciple
Pokemon cards fail Gem Mint on centering more than anything else
Going by the trademarks we've discovered, the set after Ninja Spinner should be either Abyss Eye or Storm Emeralda
The decklist above, piloted by Tulio Jaudy to a positive record at a recent Magic Online Challenge, focuses on rapidly filling the graveyard with cards like Fallaji Archaeologist and Overlord of the Balemurk
After resisting so many of Magic: The Gatherings Secret Lair drops, they went and contracted horror mangaka Junji Ito to illustrate a set of four cards in his famously unsettling style