This clever loop turns the free-casting nature of Tormod's Crypt into a continuous engine powered by the top-deck manipulation of Crystal Skull, Isu Spyglass. Because the Crypt is a historic spell, you can cast it directly from the top of your library while the Spyglass lets you track your progress. Once the spell is cast, Showdown of the Skalds triggers its chapters to replenish the +1/+1 counters that Arcbound Reclaimer needs to keep fishing the Crypt back out of the graveyard. By repeatedly sacrificing the Crypt and immediately placing it back on top of your library, Arcbound Reclaimer ensures you can cast it again and again to generate an endless stream of artifact triggers.