Arcbound Reclaimer + Showdown of the Skalds + Future Sight + Dark Sphere

Arcbound Reclaimer

Showdown of the Skalds

Future Sight

Dark Sphere

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 the lowly Dark Sphere into an endless engine of repetition, fueled entirely by the top-deck freedom granted by Future Sight. By continually casting Dark Sphere for zero mana, you trigger Showdown of the Skalds to continually reward your spellcasting with a fresh +1/+1 counter on Arcbound Reclaimer. The Reclaimer then uses that very counter to recycle Dark Sphere right back onto the top of your library, setting up the next iteration without ever losing your grip on the artifact.