Arcbound Reclaimer + Showdown of the Skalds + Urza's Bauble + Mm'menon, the Right Hand

Arcbound Reclaimer

Showdown of the Skalds

Urza's Bauble

Mm'menon, the Right Hand

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 Mm'menon, the Right Hand to let you cast artifact spells directly from the top of your library while turning your artifacts into mana sources that pay for spells cast from anywhere outside your hand. By leveraging the delayed card draw of Urza's Bauble, you can continually sacrifice it and use Arcbound Reclaimer to recycle it right back to the top of your library. Each time you cast the Bauble from the top, Showdown of the Skalds triggers to replenish the counter on Arcbound Reclaimer, fueling the engine indefinitely.