Arcbound Reclaimer + Showdown of the Skalds + Elsha of the Infinite + Tormod's Crypt

Arcbound Reclaimer

Showdown of the Skalds

Elsha of the Infinite

Tormod's Crypt

How it works

1. Cast Tormod's Crypt either from your hand or from the top of your library by paying 0
2. Showdown of the Skalds and Elsha's prowess ability trigger.
3. Resolve the Showdown of the Skalds trigger, putting a +1/+1 counter on Arcbound Reclaimer.
4. Resolve the Elsha trigger, giving it +1/+1 until end of turn.
5. Activate Tormod's Crypt by tapping and sacrificing it.
6. Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Tormod's Crypt from your graveyard onto the top of your library.
7. Repeat.

This loop turns a seemingly innocuous zero-mana artifact into a powerful engine by exploiting top-deck casting permissions and counter manipulation. With Elsha of the Infinite letting you cast noncreature spells from the top of your library at instant speed, you can repeatedly deploy Tormod's Crypt for free. Each time you do, Showdown of the Skalds triggers to supply a +1/+1 counter to Arcbound Reclaimer, fueling the Reclaimer's activated ability to constantly recycle Tormod's Crypt from the graveyard right back to the top of your library.