Arcbound Reclaimer + Showdown of the Skalds + Dark Sphere + Crystal Skull, Isu Spyglass

Arcbound Reclaimer

Showdown of the Skalds

Dark Sphere

Crystal Skull, Isu Spyglass

How it works

1. Cast Dark Sphere either from your hand or from the top of your library by paying 0
2. Showdown of the Skalds triggers, putting a +1/+1 counter on Arcbound Reclaimer.
3. Activate Dark Sphere by tapping and sacrificing it.
4. Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Dark Sphere from your graveyard onto the top of your library.
5. Repeat.

This intricate loop turns a humble 0-mana artifact into an engine for infinite triggers by exploiting the interplay between counters, top-deck casting, and graveyard recovery. With Crystal Skull, Isu Spyglass granting you the ability to look at and cast historic spells right from the top of your library, you can repeatedly deploy Dark Sphere for zero mana. Each time you cast that artifact, Showdown of the Skalds triggers its second and third chapters to place a +1/+1 counter back onto Arcbound Reclaimer. That newly acquired counter is immediately spent by Arcbound Reclaimer's activated ability to fish Dark Sphere right back out of your graveyard and place it precisely on top of your library, ready to be cast all over again through the spyglass.