When Sparring Mummy enters, it triggers, untapping Emry.
Activate Dark Sphere by tapping and sacrificing it.
Repeat.
This clever loop transforms graveyard recursion and the stack into an endless engine, fueled right out of the graveyard by Emry, Lurker of the Loch. By casting zero-mana artifacts like Dark Sphere from the bin, you trigger Displacer Kitten to blink Sparring Mummy, which in turn untaps Emry so she can do it all over again. The beauty of the mechanism lies in Dark Sphere's natural ability to be sacrificed right back into the graveyard after entering, ensuring the puzzle pieces are always ready for Emry's next activation.