When Breaching Hippocamp enters, it triggers, untapping Emry.
Activate Dark Sphere by tapping and sacrificing it.
Repeat.
This clever loop relies on Emry, Lurker of the Loch to repeatedly pull Dark Sphere out of your graveyard for zero mana, fueling a continuous engine of artifact movement. Every time you cast that zero-mana artifact, Displacer Kitten triggers to blink Breaching Hippocamp, whose flash allows you to easily fit it into the sequence while its entrance ability untaps Emry to do it all over again. Dark Sphere acts as the sacrificial fodder that keeps the graveyard stocked and the triggers flowing endlessly.