Arcbound Reclaimer + Showdown of the Skalds + Tormod's Crypt + Experimental Frenzy

Arcbound Reclaimer

Showdown of the Skalds

Tormod's Crypt

Experimental Frenzy

How it works

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

This looping engine turns Experimental Frenzy from a card-flow restriction into a perpetual motion machine by letting you play Tormod's Crypt directly off the top of your library for zero mana. Once it's on the battlefield, Showdown of the Skalds triggers on the cast to bolster Arcbound Reclaimer with a fresh +1/+1 counter. You then crack Tormod's Crypt to trigger its sacrifice ability, allowing Arcbound Reclaimer to strip off a counter and loop the artifact right back onto the library. Because Experimental Frenzy lets you continue playing from the top, you can repeat this sequence indefinitely to rack up boundless artifact triggers and storm count.