Bill's ban held strong and the block had zero cantrips
Who wouldn't run it if you could reliably cast it
This is a printing test that slipped into the wild, which explains the price
Frequently your level 1s just lie around on the field, be it Specter or Lantern, from your opponents turn, meaning you can summon Kinka-Byo, revive another level 1 Ghostrick then XYZ with the 2 Ghostricks for Dullahan and then let Kinka-Byo return to hand
Special Summon 1 EARTH Beast monster from your Deck or GY, with an equal or lower Level than that monster's original Level, then your opponent can Special Summon 1 monster from their hand
Thats an absurd amount of mana to work with, to say nothing of the additional synergies dropping a lot of artifacts at once enables