Arcbound Reclaimer + Showdown of the Skalds + Urza's Bauble + Mystic Forge

Arcbound Reclaimer

Showdown of the Skalds

Urza's Bauble

Mystic Forge

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 loop relies on Mystic Forge to let you continuously play Urza's Bauble directly from the top of your library for free. Every time you cast it, the second and third lore chapters of Showdown of the Skalds trigger, giving you a way to feed counters back onto Arcbound Reclaimer. As you tap and sacrifice Urza's Bauble, you can use Arcbound Reclaimer's ability—fueled by those very counters—to place the bauble right back on top of your library, setting up an endless loop of artifact casts, sacrifices, and future card draws.