Arcbound Reclaimer + Showdown of the Skalds + Urza's Bauble + Future Sight

Arcbound Reclaimer

Showdown of the Skalds

Urza's Bauble

Future Sight

How it works

1. Cast Urza's Bauble 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 Urza's Bauble by tapping and sacrificing it.
4. Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Urza's Bauble from your graveyard onto the top of your library.
5. Repeat.

This clever loop relies on Future Sight to let you play cards directly from the top of your library, making Urza's Bauble entirely repeatable as a zero-mana artifact. Every time you cast the Bauble, Showdown of the Skalds triggers its second and third chapters to place a +1/+1 counter right back onto Arcbound Reclaimer. You can then immediately spend that counter using Arcbound Reclaimer's activated ability to recycle the sacrificed Bauble straight back onto the top of your library, ready to be played again.